This is a problem I've had with Europa IV mods and Crusader Kings II mods ever since workshop support was introduced. I hit subscribe and the mods never show up in my launcher or in any folder in my directories. It might be a problem with me having multiple hard drives as it sometimes causes folders to be cloned onto both my document directories but I have no idea how to fix that with steam's settings. I've tried to just kind of ignore it but now, seeing a lot of great mods that I really can't get my hands on it is just really frustrating me. Looking up the problem I've been able to find no solutions that work.