OS X Mountian Lion is available on the Mac App Store for $20, but some users are having trouble downloading the OS X Mountain Lion installer to their Mac after purchase.
Errors, “This item is temporarily unavailable. Please try again.” An unknown error occurred (100).”
Fixing the Mac App Store error 100 issue will take a few moments, and then you’ll start downloading the latest version of OS X.
How To Fix Mac App Store Error 100 (Easy)
Exit the App Store.
The first step is easy to try, but it doesn’t always fix the problem, so if that doesn’t work, be prepared to move on to the more advanced error 100 fix.
Sign out of the App Store – Click on the Menu Bar – Select .
Click the menu in the menu bar and select .
and sign in to the App Store to retry and download OS X Mountain Lion.
This will fix the problem for many users, but if the problem persists, follow these detailed instructions.
How to Fix Mac App Store Error 100 (Advanced)
If the previous fix does not fix the error 100 issue in the Mac App Store, Matt Gemmell possible offers solution.
Exit the Mac App Store – click on it and select it.
. This step is for developers or users testing OS X Mountain Lion prior to release.
.
Delete this folder to fix the Mac App Store Error 100 message.
Select the com.apple.appstore folder and save the .
and try downloading OS X Mountain Lion again.
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