[2022] When i subscribe on the mod they say to me :" installation of this mod failed"

Are you doing this in our launcher, on the Steam Workshop site, or our mod site mods.paradoxplaza.com ?

Either way has it ever worked ? Or never yet?  

I am sorry but I have trouble understanding what you are telling me here.

So our launcher and game work OK from Epic? But you are having some trouble with mods?

Is that all mods, just one or some?