[2019] File lost on downloading

This was after verifying your files correct?

Do you happen to have a copy of the specific crashstack? It's saved in this folder location:

\SteamLibrary\steamapps\common\ATLAS\ShooterGame\Saved\Logs

It'll be the .crashstack file which can be opened with notepad. You can attach it to this post, or upload it to a site like www.pastebin.com and send us the info

And you're getting this crash every time you're in the main menu?