The most reliable platform. Steam automatically downloads the verified v0.7.1 patch (or the most current stable branch) directly from the developer's repository.
If you are looking for specific legacy builds or want to know more about the progression of the game's updates, engaging with the official community can help point you in the right direction. baldis basics plus v071 verified
The v0.7.1 patch specifically tuned the new field trip minigames introduced in the previous major update: Pick-Quick-Nic: The most reliable platform