Oh I thought you meant the game crashes whenever you try to start it. So you've installed it but the issue is that you cannot find the game folder. Okay I understand now.
The game should be installed in the C drive. So you'll just need to hit the Windows Key on the keyboard, hold it down and press E. This will bring up the File Explorer window (or you can press
this icon on your taskbar). After that look on the left hand side of the window and you will see something probably named OS (C:) or similar (
picture reference here). Double click that and you will see folders and there should be named one FeralHeart. Open that folder and double click the FeralHeart.exe to play.
I hope I understand what you mean by not being able to find the new version.
Actually if you meant you can't find the new installer then you will just need to go into your downloads folder and look for the FHSetup1.5.exe.
I'm on my phone right now otherwise I would have provided screenshots for you to look at. If the instructions aren't clear enough I'll try to do that instead. Added screenshots