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Apparently, there is a beta/demo for this game. It goes through the Prologue, which is rather short and serves as a general introduction to the text/choices systems, and either some or all, not sure which, of Chapter 1.

The keys are free, though they require not only a Steam account, but also signing up to Alienware.

https://www.alienwarearena.com/ucf/show/2140702/boards/giveaways-and-contest-na/Giveaway/werewolf-the-apocalypse-heart-of-the-forest-closed-beta-key-giveaway

Enjoy.
https://www.gog.com/game/werewolf_the_apocalypse_heart_of_the_forest_demo