UE4 restoring a saved over level?

I am working in UE4 and had a computer jump while I was scrolling down to Open Level and the computer clicked save current instead on the initial project screen. Now when I try to open the level, it says that the file was saved with a newer version of Unreal and opens up to a black screen. How do I restore the old project and get my level back? I looked in the saved folder and it is blank.