If the beta branch is unavailable or you need a clean standalone copy, you can download the specific depot directly from Steam's servers.

: Once the "Download Complete" message appears, go to your Steam installation folder: ...\steamapps\content\app_264710\depot_264712 .

In the "Beta Participation" dropdown, select: .

: It includes the Living Large features (like the Large Room and glass domes) without the bugs introduced in subsequent security patches.