Restart your Steam client and will automatically download the latest patch which definitely removed Denuvo Anti-Tamper DRM! https://steamdb.info/app/1544020/depots/ https://store.steampowered.com/app/1544020/The_Callisto_Protocol/ https://callisto.sds.com/en-us
Hated callisto protocol. I wound up just playing on easy so I could get through it as fast as possible.
The atmosphere was pretty good, but the entire game annoyed me from beginning to end.
Hated it. Quit when I found out I wasn’t allowed to kill the terrorist who crashed my ship and killed my partner.