latest game update broken?

Im talking about The last update on warhammer 2 with 9.3GB size

When I click update my drive C instantly gets filled (and I have about 57GB free space ) and then steam says I dont have enough space, even tho my game is not even on drive C. And then afterwards when I press update it tries to download the whole game again.

Anyone has a fix for this? I could hardly find the files that steam made on my drive C Its so annoying