Lỗi an error occurred while preparing the installation. try running this application again

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I keep geting the following error when attempting install: "An Error Occurred While Preparing the Installation. Try running this application again."

I have checked the system clock using terminal and it appears to be correct so I'm at a loss on how to resolve this. Any ideas?

Replies

Same here. I have tried every which way. Install from new Admin account. Make sure full securitu is enabled. Install to fresh Container.

Nothing.

Have you tried resetting the NVRAM/ PRAM?

Shut down your Mac, then turn it on and immediately press and hold these four keys together: Option, Command, P, and R. You can release the keys after about 20 seconds, during which your Mac might appear to restart.

Reset NVRAM or PRAM on your Mac - https://support.apple.com/en-us/HT204063

Installing now:

- T2 Security had to be set to full and the main boot partition (Mojave) authenticated. Permitting boot from external disk appears to be ok.

- Install had to happen from a Container that had the Beta Profile installed.

What I ended up doing is:

- Enabled T2 in Recovery

- Create a Container for Catalina

- Install Mohave with a few desired utilities in case they need "grand fathering."

- Install beta profile

- Run update from System Preference Panel

I've having this issue too. My dev machine is a 2015 MBP 16/512.

"An error occurred while preparing the installation. Try running this application again"

I just restored my 2016 MBP to factory settings, tried installing and I’m still getting the error

Yes same on a new Macbook Pro too

I had this issue too.. My solution was to install Xcode 11 Beta 1. Once this was installed everything worked without a problem. I did the install on an iMac running Mojave. So this may help.

What version OS was this from? Internal or external drive as target?

I am installing from Mojave, but have Xcode 11 on a Catalina partion.

was having same issue while trying to install Catalina (beta) over latest Mohave(beta),

I fixed it by downloading again the entire Mac OS Catalina ( remove "Install macOS 10.15 Beta.app" under "/Applications" first)

most likely the data got currupt due to multiple resumes during download,

before that I tried all these without any success:

- check time/date if valid

- run repair with Disk Utility ( it did found some issues(and repaired) but didn't solve the original issue)

I tried installing Xcode 11, re-download Catalina and repair disk. No luck
Anyone have another idea?
I have Catalina b2 goin to b3. Main drive.

The message might say that an error occurred while downloading, preparing, or installing, or that the installer is damaged or could not be verified.

The cause of messages like these can vary, and sometimes they are only temporary. If the message recommends a solution, such as to redownload the installer and try again, please try that first. The other solutions here are organized starting with the easiest. If the issue persists or you need help, please contact Apple Support.

Check your internet connection

Even if you're not installing macOS from the internet, the installer needs the internet to get firmware and other information specific to your Mac. Make sure that your Mac has a working and stable internet connection.

Install in safe mode

Apple silicon

1. Shut down your Mac.
2. Turn on your Mac and continue to press and hold the power button until you see the startup options window.
3. Select your startup disk, then press and hold the Shift key while clicking “Continue in Safe Mode.”
4. Log in to your Mac. You might be asked to log in again.

Intel processor

1. Turn on or restart your Mac, then immediately press and hold the Shift key as your Mac starts up.
2. Release the key when you see the login window, then log in to your Mac. 
3. You might be asked to log in again. On either the first or second login window, you should see ”Safe Boot” in the upper-right corner of the window.

Install after repairing your disk

Install from macOS Recovery

Install while your Mac is started up from macOS Recovery. This gives you the latest version of the macOS currently or most recently installed. To start up from macOS Recovery, follow the appropriate steps:

Apple silicon

Turn on your Mac and continue to press and hold the power button until you see the startup options window. Click the gear icon labeled Options, then click Continue.

Intel processor

Turn on your Mac and immediately press and hold Command (⌘)-R until you see an Apple logo or other image.

If you're asked to select a user you know the password for, select the user, click Next, then enter their administrator password. When you see the utilities window in macOS Recovery, select Reinstall macOS, then click Continue and follow the onscreen instructions. Learn more about using macOS Recovery to reinstall.

Install after erasing your Mac

Published Date: June 21, 2022