- The most recent versions are generally best, but if you're downloading mods you'd probably want to download the "legacy" version (
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) as well since people still make mods for it. Release versions have an in-game mod converter but it's not great IMO.
- Buying it on Steam would save the hassle of checking here every so often to see if it's updated, but updates are also pretty infrequent. As far as I can tell there's functionally no difference between any version uploaded here and the Steam version since the only online access is for downloading mods in-game.
- The CUM patch is a (now abandoned) community patch that made a bunch of improvements and reintegrated some features that were left out after the game got rebuilt for an engine update. It's not actively updated anymore, I'm pretty sure the guy who made it mostly stopped doing BB stuff other than an improved version of the standalone level maker.