Retraich

After you have downloaded it, extract the .zip file. İn that folder, you should see a main.exe or atleast a file called main. That is what runs the game. Don't take that .exe file out of that folder, it is dependent on the assets with its path, you might see a warning where your firewall discovers a virus, click "more information" and hit "run anyway".

Saves won't work at first. That's because you need to download the savefile.txt and put it in Saves/memory_card folder. The console will let you know if it has worked