5.3 Alpha 4.8.5 has been released! This is our build for September on our revised roadmap. It contains a large number of bug fixes (including one bug that was 16 years old) and a few new and experimental features to try out.
We have temporarily rebranded as "Project OutFox" for the time being, as we need to get some paperwork done in order to use the "StepMania" name.
As always, the download links and a full changelog are on the release page. Be sure to report any issues you find.