Lost files after update

I just updated from 7.10.0 to 7.11.0, and everything I was downloading is gone. It set itself to a new download folder, yet somehow that folder wasn’t there. I went to the old folder and it wasn’t there either. I searched the entire drive, and the download folder and everything in it, including completed downloads, is nowhere to be found. It’s not in the recycle bin either. How do you make a program that completely wipes clean all its activity upon an update?