If your Steam account is tied to beta then this is most likely to cause the issue.The downloaded cache include the broken files.If the Steam Workshop folder contains corrupted files.Well, there are many different reasons responsible for mods not downloading when I subscribe Steam workshop problem. The Steam Workshop not downloading mods issue when appears you may face that the mods can’t be registered for downloading and missing in the download queue. Here you will get the complete information on what causes Steam Workshop won’t download issue and how to fix it? Why is My Steam Workshop Not Downloading Mods?