This item wont install fully, and I can't see (or seem to find) what might be missing or what is wrong. Removed it a couple of times from workshop content-mgr ingame, keeps saying install pending (orange V) after renewed subscribing to competition content. This item is not visible in MOD MGR (what i'd call - the external view) imho the solution could be relatively simple: either the mssg states what is missing, or user is being redirected to list which shows what is requiered and what is missing. In all other cases a more accurate error message might be handy, (guessing that this is not the case here, just to be bo complete.)
In the content manager ther is a description of the content on the bottom right when you select or maybe an arrow that deploys the content below ... Just check cars/tracks and versions yoi have or not ... All content is not automatically subscribed if neede, you need to install it by yoirself.