I've installed OS X Maverick which was downloaded by someone else and was registered to other apple ID, that's why I can't install maverick free apps like keynotes, pages…how can I roll back to my mountain lion or start a fresh install or change the registered user of maverick I'm using right now?
I don't have any time machine back up or any installation disk.
MacOS – Roll back to Mountain Lion without time machine backup
macostime-machine
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Best Answer
Open the Mac App Store.
Then go to the Menu "Store" > Sign Out.
Now you can login with your account and you should be able to download the desired software.