The most secure way to obtain the game is through official storefronts. Once purchased, Steam automatically keeps your game updated to the latest version (currently 1.20.x), but you can manually revert to older builds. : Planet Zoo on Steam Official Site : Planet Zoo Store How to Download Version 1.2.5.63260
: Newer DLCs and save files may not be compatible with this older version. To avoid automatic updates, it is recommended to launch the game in Steam's Offline Mode or copy the files to a separate directory. Guide: How to download older versions of a game on Steam Download Planet Zoo v1.2.5.63260
: Use the following syntax in the Steam console: download_depot The most secure way to obtain the game