Change Appstore user from MacBook? I bought a used MacBook Pro, and I need to update some software.  When I click the 'update all' button to proceed, it asks for the App Store password of the old user's account:



How do I remove the old user's account so that I can update my software?
You will need to go to Store->Sign Out, then sign in with your own account.

After that, delete the software that is asking for the old account password, and reinstall it under your account. If the software is not free, you will need to buy the software again.  You do not have a license to use the software, unfortunately.

In your case, there’s only keynote needing an update so you know keynote had that account tied to it.