These are false positives. What about the other 68 vendors who didn't find any issues? Also, you scanned only the game's exe file, what if there's a virus is in the remaining 5GB of game data?
It's good that you're cautious but these security vendor aggregators are not the be all end all of cyber security. The game doesn't need an internet connection, so play it in an isolated sandbox or virtual machine if you want to be careful!