How to install the update of the beta before peace in our time from github?

I'm trying to go back to the prior update so i can finish my game, but i think i installed it wrong because it keeps crashing after the M loads and whilst loading some of the pictures are from vanilla. I followed this guide How to install HOI4 mods from external sites Tutorial for Hearts of Iron IV | HOI4 Tutorials but I am not sure what I did wrong.