Every time I try to load the latest version, that is meant to work with mixin booter 7.1 instead of 8, I can't get past the start screen. Start screen says it requires mixin booter 8 to load, but this version is supposed to be for 7.1. Can send screenshots and logs if needed.

Versions

Minecraft: 1.12.2
Forge: 14.23.5.2860
Universal Tweaks: 1.12.2–1.8.0-MB7
MixinBooter: 7.1
ConfigAnytime: 1.0

I encountered the same issue, due to some problem I could only use MixinBooter 7, but UT requires 8.0+.

Thanks for the report, this was just a quick oversight from my side. Re-uploaded on both CurseForge and Modrinth.