My game started being flagged by Windows Defender for no reason as well. Funny enough my GF tried downloading this game to test if this was some kind of shenanigan and to our surprise, this got flagged too.
If you're on Windows 11, you gotta look for the Security settings and restore the quarantined file on Window Defender.
Also you may wanna check if your game is getting flagged on someone else's PC too since we're all using the same engine.