If you trust the source and want the game to run, you will need to add an exclusion to your antivirus. Open . Go to Virus & threat protection settings .
Platforms like Steam, Epic Games Store, and GOG offer deep discounts (often 75-90% off) and frequent free-to-play weekends.
For LAN play specifically, (available on GitHub) is a safer, open-source alternative to onlinefix64.dll .