: You can purchase the current, secure version on Steam .
: Official versions support up to five players in online co-operative play, which is much more stable than older cracked versions. System Requirements (PC) Ready or Not Free Download (v20221210 Co-op)
The version mentioned in your query (v20221210) is from the game's Early Access period. Since then, the game has reached its , featuring significantly more content, improved AI, and better optimization. : You can purchase the current, secure version on Steam