i have downloaded fallout character overhaul but im having a problem getting archiveInvalidation to work.:/

any help please!!

Are you using a Mod Manager like FOMM Or NMM? Well, FOMM is best for this game..

Anyway, you just toggle this off then on in the mod manager and your good to go. AI will not fix a messed up mod install though, which should not happen if your using a mod manager.