The upgrade gives an error and has reloaded for 4. I have also tried resetting the computer as well as deleting Adobe and reinstalling it. It still doesn't load though and so I can't edit the desired document.
Update: The next day. Now it no longer reports an error but stops at 90% and stays there. I left it twice for an hour, but the % didn't change or it didn't load. I also restarted both the program and the computer. Nothing.