Mod directly went to 1.20.1

So no 1.20?

1.20.1 was a hotfix. This means you should not play on 1.20 at all.

Many mods dont update to 1.20.1 so that 🤷 often I see just update jumps, like you going directly to 1.20.1, there will be people directly going from 1.20 to .2 or something. Or just slow updating

Many mods work if multiple versions, but in this case I specified specifically that you need to be on 1.20.1 to play.
See this file, where I specified the dependencies.

You could technically alter the .jar file to make this say 1.20.0 or >=1.20.0 and try it out if you want.
But I did not test this or guaranty anything working.