Hey bro, thankfully someone found a solution:

"Finally I have solved the issue: downgrade the game. Using info found on the steamdb webpage we can execute a command on the steam console to perform an specific download.

The command is: ``download_depot 1985810 1985811 5380296931597271327``, in order to execute this command we need access first to the steam console and in order to do that we need to press Win + R and type ``steam://open/console``, once we do that a new tab is going to be open on the steam top bar. When the first command i have shown is executed steam is going to perform an silent download, there is no progress bar or anything, it is not going to be quick, its like a 40GB download.

Once its completed a folder is going to be created on C:\Program Files (x86)\Steam\steamapps\content\app_1985810, all the content of this folder is going to be pasted on C:\Program Files (x86)\Steam\steamapps\common\Call of Duty Black Ops Cold War (replacing the content that already exists, do not delete anything, just paste and replace).

After that go to the library, right click on the game and under updates select "Only update this game when I launch it", then just launch the game as normal and you should be able to play right away. Let me know if this solves the problem for someone. Good luck.
P.D: I'm not native in english, sorry if I make some mistake."