Master source is on the gitgud; you'll need to download and compile it. Instead of going to Releases, go to the main project page, or the Repository page, and find the little download button in the upper-right corner (between Edit and Clone); README.md has the instructions for compiling it (but basically, on windows, just run compile.bat, and the output will be in the \bin folder).
Alpha 27 is almost two months old, unfortunately; I'm not sure when Pregmodder is going to push another release, but the user experience for AI art has been vastly improved since then.