I'll try Malwarebytes, and see.
Still, most games on here are optimised to NOT trigger even false positives. Norton and Avast and Trend and the like, are BY FAR the MOST common protections in use. Specialist programmes used by people with more advanced computing knowledge are the minority, and I find it tenuous to imply they are not trustworthy.
As I said already, this is has NEVER happened with ANY other game I have ever downloaded from this site. EVER.