Thanks to everyone that's enjoyed this mod over the years, and apologies for disappearing. Real life snuck up on me.
It looks like dansheps has forked YayMounts to Bestride and is updating it there. So if you want this mod still, go check that out at https://wow.curseforge.com/projects/bestride-mm or on github at https://www.github.com/DanSheps/bestride