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
: Once finished, Steam will provide a path (usually SteamApps\content ) w2.5 files are stored. You can run the game directly from its .exe file in that folder. Download Planet Zoo v1.2.5.63260
: 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 The most secure way to obtain the game
: Use the following syntax in the Steam console: download_depot You can run the game directly from its
Since this specific build is an older version, you must use the and SteamDB to fetch the original files.
: Look up the Planet Zoo (App ID 703080) on SteamDB and find the Manifest ID associated with version 1.2.5.