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
I picked it up on sale and played it over a weekend and it felt worth it. It's a decent story with great Dead Space gameplay. As an old person it's nice to be able to finish a game. This one isn't 300 hours of pointless walking. It shipped in a sorry state, I'll admit that.