OK the fix for this problem .. is that the publisher did not upload the meta.cpp correctly
It should be for this mod
According to this article it should be
meta.cpp should look like this .. the uploader had publishedid = 0 ;
protocol = 1;
publishedid = 1251898702 ;
name = "RSPN Cave Systems";
timestamp = 5248189329180407904;
I can't remember ever see that worked for steam mods ..only non steam mods.
Don't believe there is a way to verify a community workshop item.. i've always just unsubbed.. checked the workshop directory to make sure is gone .. then resubbed
There may have been and update to the mod, or was removed from steam .. that happens as well .. gets pulled from steam by author .. usually they have a github repository or armaholic post for their mod .
OR since this is a CCG only mod .. try the CCG Forums
This sounds like you have autoupdate on steam disabled - and you dont have the latest version of arma.
Open Steam Library - right click on Arma 3 , select properties , then click the updates tab at the top.
Where it says automatic updates , it should say ( Always Keep this Game up to Date ) .. if not change it to that .. or if your on a laptop and its turned off ....it wont update.
If that's the case restart steam .. while connected via wifi or ethernet and it should start downloading
I just deleted all the mods I had installed while steam and a3launcher were off, launched steam and went through workshop to download manually all the mods and voila, now for some reason it worked just fine. I don't understand why the hell it did not work before.