I guess you have problem downloading game from browser right? that's normal for small size games (or cracked software,...) AV always try to scan things downloaded from browser (in it in small size), if windows defender detects this is cracked, it will block. If you don't believe, you force save it, dont start game, then upload rar file to virustotal (also includes Microsoft, and dozens of other AV providers), you will see the file is clean. Shit windows defender doesn't like piracy