I was trying to install Kenshi (2018) with a YAML install script and the game launches but the “installation” never ends and it doesnt get added to my games
Check your internet connection and please provide us with more information like logs or a screenshot.
You can find out how to provide logs and detailed information here
Additionally, you can check network and disk usage in system monitor or using external tools like iotop and iftop to check if game is getting downloaded and installed or nothing is being done