Mac – App from Mac app store not installing

The solution is to keep 2 separate AppleID accounts:

1. One for the country you used to live in, with a valid address for that country. Credit Card may be expired as it's not needed for updates.
2. Another for the country you live in now with your current details.

I've had a long email conversation with Apple re the subject, but they don't allow for purchase transfers between countries. They treat each country's store as a separate entity with no option to transfer purchases between.

Unfortunately this means, that in order to get an update for the apps which are attached to different AppleIDs you have to log out and log back in with different details. This is a bit of an inconvenience, but still cheaper than buying all the apps again.

You will want to drag the following to trash and then quit and re-launch the Mac App Store:

• /Library/Application Support/ProApps/Aperture System ID
• /Applications/Aperture.app

If restarting the app store does not work, a reboot should clear any remnants of the older licensed Aperture product and let you install. Apple support is also very helpful if you need assistance removing an old serial number from a Mac. You don't have to necessarily tell them how you got the old serial number if you feel it may make them or you uncomfortable. I can't imagine a scenario where they wouldn't be delighted to assist you in procuring a legitimate license of the latest version of Aperture.

You can also use the mdfind command to search the entire hard drive for files with Aperture in them. Be prepared for a lot of files. I've never heard of people needing to delete all the Aperture directories, but you might also look to move these to trash as well:

~/Library/Preferences/com.apple.Aperture.plist 
~/Library/Caches/Aperture
~/Library/Application\ Support/Aperture