JustInCaseWeNeedIt
no small " j " like some put it. Case sensitive.
and then once you have previous version then type in the code again.
Then Everything will work, just like before the update.What a headache.
New Update FIX.
Steam Library -> Rocksmith 2014 -> Properties -> Betas -> (Enter beta code) = JustInCaseWeNeedIt
Select the beta = previous version.