Since the last update, all my DLC vanished. Even though, steam states, that I've got 85 DLC, in game I got only the Trainingcenter, and it (the game) proposes me, to rebuy all my DLC... (actually, Steam doesn't let me rebuy them, as Steam states that I already bought them/own them...) Ah...ok...after checking file integrity on Steam it just started redownloading all my DLC...280 GB, approx. 21 hours....
grob-e , Have you been making any modifications to your installation folder. If an update comes in, and it can't find the DLC ".pak" files, it will assume it needs to redownload them, a process you can't stop.
Me? Nah, the update has deleted the /Content/DLC-folder...(ok, I had a couple of usermade timetables in it, downloaded from Trainsimcommunity)
Yes, not sure what happened but there was massive file corruption which pretty much requires the whole game re-downloading to repair.
Ah, it's likely Steam thought the files were corrupted due to the modifications, and therefore redownloaded a fresh copy.