It's always the same error that happens every time there's a new update. I had to uninstall and re-download the game. This happened last month with The Hobbit's release.

Yesterday, September 9, I had the same issue again; I had to uninstall and re-download the game.I downloaded the game via Steam, and it was ok, but because I already have an account, I have to download another 1.44 gb

While the game is downloading the required files, the download starts normally and manages to download some data, but after a while it stops(around 50\60mb) and gives me the error. Restarting the game lets it continue for a bit, but eventually the same thing happens again. Over and over....

This is unacceptable because it is an old, well-known bug. FIX IT!!

P.S.
Bear in mind that this is a serious issue, especially for those who already purchased the mastery, because basically you can't play the game for days. Yes, to complete the download of just 2gb you have to spend at least a couple of days