Not generally a fan of asking this, but I just did an OS upgrade and wasn't thinking about this particular game so I've lost all my progress. Are any saves available so I don't have to go through the whole game again to enjoy the new patch?
Happened to me too. Windows blue-screened on me and I had to reload it. Found almost all my old saves/settings in Windows.old/user/[yourname]/appdata folder. Check all subdirectories until you find your saves. You might be surprised by what you find in there (maybe your old game directory?).
You might have to click on 'Show hidden files/directories' in file manager to find it. When you do, just copy/paste your old settings into your new appdata folder, making sure to recreate the directory tree as well, if you haven't already started the game. That way, the game will be able to find your old settings.
If that doesn't work, then sorry, you're SOL and have to start over. Good luck!