I've used it for quite a few projects in the past, but have stopped using it a few years ago. Yeah it became unmaintained. I know someone else ended up taking the project over, but I haven't really followed that ever since. Looks like there are many new features.
The fact it's Windows-only, and based on MFC is also what got me off it in the end. (This last point is particularly annoying as MS has stopped supporting MFC.)
I took a look - seems the new developer hasn't released the source code? There are only binaries on Github?