I saw 2 other programs using a pre-release of the lib. But I couldn't find the lib anywhere! I found the binary for the test, but not the source.

I think you have to e-mail Sgstair for the source.
He's done this because the library isn't quite complete and he didn't want hundreds of source releases floating around, some being incomplete.

You do know what a "pre-release" is, don't you? I mean, the very essence of the word says "it's not released yet"...
Why do you expect it to be "released", given this information?

-Stephen