It's not a bug, so reverting to an earlier build just means you'll be stuck using that earlier build pretty much until someone else decides to fix those themes (or if they're improperly licensed and the author is gone, forever).
There is no "step by step" guide. Unfortunately if someone were to tell you the steps it'd basically be the same as them actually fixing the theme, in which case why not just fix it themselves, right?
If you want to fix a theme that hasn't been fixed, you're going to have to take a little time to familiarize yourself with the basics of WPS making.