An Error Occurred While Preparing the Installation Try Running This Application Again El Capitan

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Two unusual error messages that can occur while attempting to install OS X El Capitan or OS X Yosemite are: "This copy of the OS X El Capitan installation application cannot be verified. It may have been corrupted or manipulated during download ", or" This copy of the Install OS X Yosemite application cannot be verified. It may have been corrupted or tampered with during download ", or a vague message" An error occurred while preparing to install. Please try again "error message. Sometimes these can be resolved by simply rebooting and attempting to reinstall OS X (or downloading the OS X installer again if it was corrupted), but if the error messages persist, you may find that you have the system your Mac. can be the resolution.

It is possible to encounter these errors during almost any type of installation attempt in OS X El Capitan or OS X Yosemite, ranging from the standard App Store update, using Internet Recovery to cleaning up installations and using a bootable installation volume on a target Mac.

If you encounter either error message while trying to update or install OS X while running OS X actively (for example, a standard upgrade from the App Store), you can usually fix the problem simply by checking the date and time on the Mac to be set automatically. To do this, go to the  Apple menu> System Preferences> Date & Time and make sure the "Set date & time automatically" option is checked:

However, that method requires the Mac to have active internet access. If you are using a computer with no Internet access, or if you run into the problem during an alternate OS X installation method and thus cannot access System Preferences, the next option is to go to the Terminal to set the date.

To determine whether the Terminal date trick can fix these error messages and help you to install OS X successfully, you need to go to the command line in the boot menu "Install OS X". Pull down the "Utilities" menu option and choose "Terminal," then type the following command in the prompt:

date

Hit return and if the reported date is anything other than the actual current date, then you've almost certainly found the source of the problem. This could look something like this:

Mon Jan 19 9:55:15 AM PST 1984

The whole line is important, like the date must be correct to install OS X., especially the year, because if the date set is before the release of OS X, the error is triggered. Pay special attention to the year as a clear indicator of something wrong. If you find that the date is not correct at all, you can set the current date and time with a variation of the same terminal command. You now have two options: set the date via the internet or set the date manually. Setup via the internet is easier:

ntpdate -u time.apple.com

However, that won't work if the Mac doesn't have Internet access. So you should use the 'date' command again, but with manual specifications.

The manual date format to use is a bit weird, if you are familiar with the command line you can get it yourself using date -help which looks something like "dd]HH]MM[[cc]yy]"

In simpler terms, it is: Month Date Hour Minute Year, and it is entered as a solid line with no gaps or spaces between the digits. For example, to set the date to "September 20, 2020 at 5:33 PM", use the following syntax:

date 0920173316

It may look like a random string of numbers, but it's actually the month 09, date 20, time 1733, and year 16 combined.

Once you've entered the correct date and hit return, you can exit Terminal and start the installation process over as originally intended, and OS X should no longer be throwing the untrustworthy errors.

Note that sometimes you will see the message "This copy of the OS X Yosemite application installation cannot be verified". It may have been corrupted or manipulated while downloading 'error message because the actual installer was modified or corrupted during download, to make sure it isn't always download the OS X installer applications directly from Apple and the App Store, and never from a third party site. Sometimes also the message "An error occurred while preparing the installation. Please try again "error message appears and resolves itself by simply rebooting. Nonetheless, these two error messages also show up when the system date is set incorrectly on the Mac, and that's clearly what we're discussing here.

This troubleshooting trick was left in our comments by DAVIDSDIEGO who found the solution at bensmann.no. It is noteworthy that both users encountered different error messages despite the same resolution.

Let us know in the comments if this helped resolve these particular error messages for you, and if not, which method worked to fix the installation error with OS X.

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