Apple’s latest macOS, Catalina, has just been released to the public last October 7, 2019 and you can now install it on your Mac, as long as your device meets the hardware requirements. First revealed during the WWDC 2019 conference in San Jose, California, macOS Catalina introduces some new exciting features and functionalities.
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As we say goodbye to iTunes, macOS Catalina brings in new apps and features to the table, including Apple Music, Podcasts Books, and TV. Another major feature is Sidecar, which can turn your iPad into another display. For ordinary users, this means getting a secondary display for free. For developers, on the other hand, this secondary screen can be used as a drawing tablet using supported apps.
With the release of macOS Catalina 10.15, a lot of Mac users are enthusiastic to install the newest Mac operating system. Just like the previous versions of macOS, some were able to upgrade without a hitch, but several users encountered various issues during downloading and installation of the update.
Some users experienced slow downloading of the update, while others got error messages when installing Catalina, including:
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- Storage system verify or repair failed
- This copy of the Install application can’t be verified. It may have been corrupted or tampered with during downloading.
- An error occurred while preparing the installation. Try running again.
- Copy of install macOS application is damaged and can’t be used to install macOS.
- There is not enough free space on the selected volume.
This guide will give you a detailed rundown of the most common macOS Catalina installation and update errors encountered by Mac users when upgrading or installing macOS Catalina, along with the instructions on how to deal with these hiccups.
Why macOS Catalina Won’t Install
Various problems can occur during the installation of macOS Catalina. If the installation won’t start, seems to freeze midway , or never seems to complete, then it means that there must be something wrong somewhere.
The first main reason why users can’t install macOS Catalina is compatibility problem. If your Mac doesn’t support macOS Catalina, you won’t be able to proceed with the installation. You need a fairly recent Mac to be able to run macOS Catalina. Here are the Mac models that support the newest macOS:
- MacBook (2015) and later
- MacBook Air (2012) and later
- MacBook Pro (2012) and later
- Mac Mini (2012) and later
- iMac (2012) and later
- iMac Pro (2017) and later
- Mac Pro (2013) and later
If your device is not on this list, then you’re sure to run into problems when installing Catalina.

Another thing you need to check before installation is your available storage space. You will need around 6.5 GB just to download the installer. Once you’ve downloaded it, the amount of space you will need during the installation depends on whether you’re doing a clean install or an upgrade.
A clean install will eat up around 20 GB of storage. On top of that, you have to make room for apps, user data, and user updates. An upgrade install, on the other hand, will only take up 6.5 GB of space for the installer, plus some installation files that the installer will copy to your startup drive.
If you’re tight on storage space, you should consider removing unneeded apps and files on your Mac. You can uninstall the apps one by one, and delete cache files and data using Mac repair app. Make sure you have at least 25 GB of free space to be able to install macOS Catalina successfully.

Aside from compatibility issues and insufficient storage, poor internet connection, incomplete or corrupted installation files, hard disk problems, and faulty software can also cause issues during the installation of macOS Catalina.
Installation Checklist for macOS Catalina
Before proceeding with the installation, it is necessary to spend some time ticking off the checklist below. These steps will not only prevent errors from happening, but also ensure that your data remains safe in case something goes wrong.
- Back up your Mac, especially your iTunes media library since Catalina will no longer have iTunes.
- Take note of the 32-bit apps on your Mac . You will need to update them to the 64-bit version after upgrading, or find an alternative for them.
- Delete old Install macOS files from your Applications folder. These old macOS installation files may cause error during the upgrade.
- Remove all external drives and accessories.
- Plug in your Mac’s power adapter.
- Connect to a stable Wi-Fi network.
Once you’ve completed these steps, you can now proceed with the upgrade.
How to Upgrade to macOS Catalina
The easiest way to download and install macOS Catalina is through the App Store on your Mac. Just open the App Store and search for macOS Catalina. Click the install button to start downloading, then click Continue.
You can also visit the macOS Catalina website and download the installer from there. The installer will be downloaded to the Applications folder on your Mac. Once downloaded, the installer will open by itself. Just follow the onscreen instructions to proceed with the installation. You might be asked to log in using your admin username and password during the process.
As long as your device is compatible with Catalina and you’ve followed the instructions, you’ll be able to successfully install the new macOS on your Mac. But if you encounter any error during the download or installation, refer to our guide below to sort out the issue.
How to Fix Common Download Errors for macOS Catalina
Downloading the installer is the first step of the installation process. The installer takes up 6.5GB of storage, but you will need more space to be able to run the new macOS smoothly. If you have Automatic Updates enabled, the installer might already be downloaded on your device.
If the installer has not yet been downloaded, go to the Apple menu > System Preferences > Software Update to download Catalina.
If the downloading process gets stuck or is taking a long time to complete, here’s what you can do:
- Go to the Apple Server status website and check if the macOS Software Update‘s button is green. If not, then there’s probably some issues with the website, so you might need to try upgrading some other time.
- If the macOS Software Update is green, but you’re still having download problems, check your internet connection. Consider switching to a wired internet connection if possible.
- If the download is stuck for a long time, cancel it by clicking the X button.
- Switch to a different DNS server and retry the download again.
It might take a few attempts for the downloading to be successful, especially in the early days of the release of the update.
How to Fix Errors When Preparing for the Installation of macOS Catalina
Once you have successfully downloaded the installer to your device, the system then prepares your Mac for the installation process. There are users who encountered errors during this stage and came across the Error occurred preparing the installation. Try running the applicationagain message.
The first thing you need to do when you encounter this error is to reboot your Mac. You might need to restart your system a couple of times to deal with this problem. If the error doesn’t go away after rebooting, here are some steps you can try:
Check Your Mac’s System Date and Time.
An incorrect system time usually gets in the way of a lot of system processes, including updates. To make sure your Mac’s date and time are correct, follow the instructions below:
- Go to the Apple menu > System Preferences > Date & Time.
- Tick off Set Date and Time Automatically.
- If the option is already checked, uncheck it then reboot your Mac.
- Go back to the Date and Time panel and check the option again.
- Next, try re-installing macOS Catalina.
Re-Download the Installer.
If the step above did not work, you might have to delete the macOS Catalina installer on your Applications folder. Find the Install macOS file in the Applications folder and move it to the Trash. Empty the Trash and reboot. Once your Mac restarts, try downloading the installer and then run the install process again.
Delete the Installinfo.plist File.
If you encounter the Copy of install macOS application is damaged and cant be used to install macOS error during the preparation of the installation, the best workaround is to delete the installinfo.plist from the installer package, then try re-installing.
To delete the installinfo.plist file, check out the steps below:
- Go to the Applications folder and look for the installer package for macOS Catalina. It is usually named Install macOS.
- Right-click on the file and select Show Package Contents.
- Click on Contents > SharedSupport.
- Delete the Installlnfo.plist inside the folder.
- Type in your admin password to confirm the action.
- Click on the installer to run it again.
How to Fix Catalina Installation Errors on Mac
After preparing your Mac, the system then proceeds to the installation process. There are different errors you might encounter at this stage, so you need to take note of the error message and at which stage it happened.
Here are some of the errors you may encounter during the installation process.
Stuck at Setting Up Screen
When you’ve been stuck with the Setting up your Mac message for several hours or you encounter the dreaded spinning wheel, the best way to deal with this is to restart your device. Press the power button to shut down your Mac, then press it again to reboot.
Storage Space Problems
If you failed to optimize your storage space before the installation, you might come across errors related to insufficient storage space. You might see the macOS Could not be installed, the target disk is too small message or the There is not enough free space on the selected volume error.
This happens because you do not have enough space on your Mac. Free up some storage first before proceeding with the installation. You might need around 20GB to 25GB of space for macOS Catalina to run efficiently on your Mac.
Network Access Error
If you see a Code=551 error anytime during the installation process, you need to check your network settings. This error happens to devices with overactive firewall or those installed with third-party security software, such as VPN and antivirus. If this happens, disable this software first before trying to reinstall macOS Catalina.
Installation Doesn’t Complete
Sometimes, your Mac gets stuck with the x minutes remaining screen during the installation. When you encounter this problem, click the X button to exit the installation process and check your console logs. It is possible that your user account is corrupted, preventing your system from completing the installation process.
The only way to deal with this is to create another admin user account and install macOS Catalina using that account.
Mac Fails to Start After Update
You might think that everything is over once you finish the installation process and your Mac restarts. But sometimes, errors can still happen even after the installation has been completed. Some users reported getting stuck with a black screen, while others encounter the spinning wheel during the restart following the update.
This error is usually caused by incompatible or corrupted kext files. Kext or Kernel Extension files are the drivers for macOS. To check whether kext files are causing the error, move all of them out of your Extensions folder before rebooting your Mac.
To move your kext files, follow the steps below:
- Boot your Mac into Safe Mode by holding down the Shift key until you see the Apple logo.
- Open Terminal under the Utilities folder, then copy-paste the following command:
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mkdir ~/Extensions-Backup && sudo mv /Library/Extensions/* ~/Extensions-Backup/
Once done, restart your Mac in normal mode and see if it goes through.
If All Else Fails, Do a Fresh Install.
If you’re still having issues despite following the guide above, you may need to do a fresh install of macOS Catalina. To do this:
- Shut down your Mac.
- Press Power + Command + R keys to bring up the macOS Utilities screen .
- Click Reinstall macOS.
- Select Disk Utility > Erase HDD.
- Install the macOS Catalina from here.

Remember that erasing your HDD will delete all of your files and settings, so make sure you have a backup before doing a fresh install. This should hopefully take care of common macOS Catalina installation problems.
NOTE:
Between mid October 2019 and mid February 2020 everyone in the Army was migrated to use their PIV Authentication certificate for Email access. You no longer use the Email certificate for Enterprise Email or any CAC enabled websites
Mac users who choose to upgrade (or already have upgraded) to Mac OS Catalina (10.15.x) or Big Sur (11.xx.x) will need to uninstall all 3rd Party CAC enablers per https://militarycac.com/macuninstall.htm AND reenable the native smart card ability (very bottom of macuninstall link above)
If you purchased your Mac with OS Catalina (10.15.x) or Big Sur (11.xx.x) already installed, you can skip the uninstall part above and follow the instructions below.
6 'high level' steps needed, follow down the page to make this a painless systematic process
1. | Is your CAC reader 'Mac friendly'? |
2. | Can your Mac 'see' the reader? |
3. | Verify which version of Mac OS you have |
4. | Figure out which CAC (ID card) you have |
5. | Install the DoD certificates |
5a. | Additional DoD certificate installation instructions for Firefox users |
6. | Decide which CAC enabler you want to use (except for 10.12-.15 & 11) |
Step 1: Is your CAC reader Mac friendly?
Visit the USB Readers page to verify the CAC reader you have is Mac friendly.
Visit the USB-C Readers page to verify the CAC reader you have is Mac friendly.
'Some, not all' CAC readers may need to have a driver installed to make it work.
NOTE: Readers such as: SCR-331 & SCR-3500A may need a firmware update (NO OTHER Readers need firmware updates).
Information about these specific readers are in Step 2
Step 2: Can your Mac 'see' the reader?
Plug the CAC reader into an open USB port before proceeding, give it a few moments to install
Step 2a: Click the Apple Icon in the upper left corner of the desktop, select 'About This Mac'
Step 2b: Click 'System Report...' (button)
Step 2c: Verify the CAC reader shows in Hardware, USB, under USB Device Tree. Different readers will show differently, most readers have no problem in this step. See Step 2c1 for specific reader issues.
Step 2c1: Verify firmware version on your SCR-331, SCR-3310 v2.0, GSR-202, 202V, 203, or SCR-3500a reader. If you have a reader other than these 6, Proceed directly to step 3
Step 2c1a-SCR-331 reader
If your reader does not look like this, go to the next step.
In the 'Hardware' drop down, click 'USB.' On the right side of the screen under 'USB Device Tree' the window will display all hardware plugged into the USB ports on your Mac. Look for “SCRx31 USB Smart Card Reader.” If the Smart Card reader is present, look at 'Version' in the lower right corner of this box: If you have a number below 5.25, you need to update your firmware to 5.25. If you are already at 5.25, your reader is installed on your system, and no further hardware changes are required. You can now Quit System Profiler and continue to Step 3.
Step 2c1b-SCR-3310 v2.0 reader
If your reader does not look like this, go to the next step.
In the 'Hardware' drop down, click 'USB.' On the right side of the screen under 'USB Device Tree' the window will display all hardware plugged into the USB ports on your Mac. Look for “SCR3310 v2.0 USB Smart Card Reader.” If the Smart Card reader is present, look at 'Version' in the lower right corner of this box: If you have a number below 6.02, it will not read the 'G+D FIPS 201 SCE 7.0' CAC on Mac OS 11.xx.x or 10.15.7. I contacted HID (the company that makes these readers) on 14 DEC 2020 to find a way to update the firmware to 6.02. They said there is not firmware update for the reader. If your reader is older, you may need a new one. Please look at: https://militarycac.com/usbreaders.htm to find a compatible one. If you are already at version 6.02, your reader should work fine on your Mac and no further hardware changes are required. You can now Quit System Profiler and continue to Step 3.
Step 2c1c-SCR-3500A reader
If you have the SCR3500A P/N:905430-1 CAC reader,you may need to install this driver, as the one that installs automatically will not work on most Macs. Hold the control key [on your keyboard] when clicking the .pkg file [with your mouse], select [the word] Open
Step 3: Verify which version of MacOS you have?
(You need to know this information for step 6)
Step 3a: Click the Apple Icon in the upper left corner of your desktop and select 'About This Mac'
Step 3b: Look below Mac OS X for: Example: Version 10.X.X, or 11.X
Step 4: Figure out which CAC (ID Card) you have
(You need to know this information for step 6)
Look at the top back of your ID card for these card types. If you have any version other than the seven shown below, you need to visit an ID card office and have it replaced. All CACs [other than these six] were supposed to be replaced prior to 1 October 2012.
Find out how to flip card over video
Step 5: Install the DoD certificates (for Safari and Chrome Users)
Go to Keychain Access
Click: Go (top of screen), Utilities, double click Keychain Access.app
(You can also type: keychain access using Spotlight (this is my preferred method))
Select login (under Keychains),and All Items (under Category).
Download the 5 files via links below (you may need to <ctrl> click, select Download Linked File As... on each link) Save to your downloads folder
Please know... IF You have any DoD certificates already located in your keychain access, you will need to delete them prior to running the AllCerts.p7b file below.
https://militarycac.com/maccerts/AllCerts.p7b,
https://militarycac.com/maccerts/RootCert2.cer,
https://militarycac.com/maccerts/RootCert3.cer,
https://militarycac.com/maccerts/RootCert4.cer, and
Double click each of the files to install certificates into the login section of keychain
Select the Kind column, verify the arrow is pointing up, scroll down to certificate, look for all of the following certificates:
DOD DERILITY CA-1
DOD EMAIL CA-33 through DOD EMAIL CA-34,
DOD EMAIL CA-39 through DOD EMAIL CA-44,
DOD EMAIL CA-49 through DOD EMAIL CA-52,
DOD EMAIL CA-59,
DOD EMAIL CA-62 through DOD EMAIL CA-65
DOD ID CA-33 through DOD ID CA-34,
DOD ID CA-39 through DOD ID CA-44,
DOD ID CA-49 through DOD ID CA-52,
DOD ID CA-59,
DOD ID CA-62 through DOD ID CA-65
DOD ID SW CA-35 through DOD ID SW CA-38,
DOD ID SW CA-45 through DOD ID SW CA-48,
DoD Root CA 2 through DoD Root CA 5,
DOD SW CA-53 through DOD SW CA-58,
DOD SW CA-60 through DOD SW CA-61, and
DOD SW CA-66 through DOD SW 67
NOTE: If you are missing any of the above certificates, you have 2 choices,
1. Delete all of them, and re-run the 5 files above, or
2. Download the allcerts.zip file and install each of the certificates you are missing individually.
Errors:
Error 100001 Solution
Error 100013 Solution
You may notice some of the certificates will have a red circle with a white X . This means your computer does not trust those certificates
You need to manually trust the DoD Root CA 2, 3, 4, & 5 certificates
Double click each of the DoD Root CA certificates, select the triangle next to Trust, in the When using this certificate: select Always Trust, repeat until all 4 do not have the red circle with a white X.
You may be prompted to enter computer password when you close the window
Once you select Always Trust, your icon will have a light blue circle with a white + on it.
The 'bad certs' that have caused problems for Windows users may show up in the keychain access section on some Macs. These need to be deleted / moved to trash.
The DoD Root CA 2 & 3 you are removing has a light blue frame, leave the yellow frame version. The icons may or may not have a red circle with the white x
or | DoD Interoperability Root CA 1 or CA 2 | certificate | |
DoD Root CA 2 or 3 (light blue frame ONLY) | certificate | ||
or | Federal Bridge CA 2016 or 2013 | certificate | |
or | Federal Common Policy CA | certificate | |
or | or | SHA-1 Federal Root CA G2 | certificate |
or | US DoD CCEB Interoperability Root CA 1 | certificate |
If you have tried accessing CAC enabled sites prior to following these instructions, please go through this page before proceeding
Clearing the keychain (opens a new page)
Please come back to this page to continue installation instructions.
Step 5a: DoD certificate installation instructions for Firefox users
NOTE: Firefox will not work on Catalina (10.15.x), or last 4 versions of Mac OS if using the native Apple smartcard ability
Download AllCerts.zip, [remember where you save it].
double click the allcerts.zip file (it'll automatically extract into a new folder)
Option 1 to install the certificates (semi automated):
From inside the AllCerts extracted folder, select all of the certificates
<control> click (or Right click) the selected certificates, select Open With, Other...
In the Enable (selection box), change to All Applications

Select Firefox, then Open
You will see several dozen browser tabs open up, let it open as many as it wants..
You will eventually start seeing either of the 2 messages shown next
If the certificate is not already in Firefox, a window will pop up stating 'You have been asked to trust a new Certificate Authority (CA).'
Check all three boxes to allow the certificate to: identify websites, identify email users, and identify software developers
or
'Alert This certificate is already installed as a certificate authority.' Click OK
Once you've added all of the certificates...
• Click Firefox (word) (upper left of your screen)
• Preferences
• Advanced (tab)
• Press Network under the Advanced Tab
• In the Cached Web Content section, click Clear Now (button).
• Quit Firefox and restart it
Option 2 to install the certificates (very tedious manual):
Click Firefox (word) (upper left of your screen)
Preferences
Advanced (tab on left side of screen)
Certificates (tab)
View Certificates (button)
Authorities (tab)
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Import (button)
Browse to the DoD certificates (AllCerts) extracted folder you downloaded and extracted above.
Note: You have to do this step for every single certificate
Note2: If the certificate is already in Firefox, a window will pop up stating: 'Alert This certificate is already installed as a certificate authority (CA).' Click OK
Note3: If the certificate is not already in Firefox, a window will pop up stating 'You have been asked to trust a new Certificate Authority (CA).'
Check all three boxes to allow the certificate to: identify websites, identify email users, and identify software developers
Once you've added all of the certificates...
• Click Firefox (word) (upper left of your screen)
• Preferences
• Advanced (tab)
• Press Network under the Advanced Tab
• In the Cached Web Content section, click Clear Now (button).
• Quit Firefox and restart it
Step 6: Decide which CAC enabler you can / want to use
Only for Mac El Capitan (10.11.x or older)
After installing the CAC enabler, restart the computer and go to a CAC enabled website

NOTE: Mac OS Sierra (10.12.x), High Sierra (10.13.x), Mojave (10.14.x), Catalina (10.15.x), and Big Sur (11.x) computers no longer need a CAC Enabler.
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