My biggest apologies for the late reply!
My guess is that since it detects it as an unusually downloaded file, the download doesn’t complete properly and stays as a .crdownload file, so it doesn’t fully work as an .exe as it should. If it helps, I can guarantee the file is safe to download and execute. One option I can think of is downloading it with a different browser if you still want to give the game a try!
Apologies again for the lateness and for the issues!