The search results for "the-blackout-club-free-download-incl-multiplayer-build-08132021" point primarily to unofficial, cracked, or repackaged versions of the game. While these sites offer instructions on how to install and bypass standard purchasing methods, it is important to note that The Blackout Club is an online-heavy cooperative experience that often requires official server connections for progression and its unique "Enhanced Horror" features.
The 2021 builds of the game brought several refinements to the core experience: the specific build mentioned
Below is a blog post covering the game's core loop, the specific build mentioned, and what players should know about this atmospheric co-op title. the specific build mentioned
Unmasking the Mystery: A Look at The Blackout Club (Build 08132021) the specific build mentioned