Not being able to update OS X or programs means the machine is eventually going to run insecure ones which sets the stage for another large scale botnet of compromised Mac's like what occurred with Flashback, or at the very least banking and credit card information of the secondhand user could be compromised.ġ: Copy what users files you do want to save off the machine to a regular external storage drive using drag and drop methods on your internal Home folders of Music, Pictures, Movies, Documents etc. Some are just ignoring the requests for updates because they know to change ownership to them will require a complete erase of all the installed programs by the previous owner, which is a fact unfortunately. People are buying Mac's used where the previous owner didn't know or clear the machine properly before selling it, so what occurs is the next owner can't update OS X or programs because their AppleID doesn't match the previous owner.