Out-of-date drivers and operating systems can cause a variety of issues, and are one of the first things to check when a game is having problems.
Network folder installations of this game are no longer supported. Please move your game folder to a local drive, then try again.
How to install Call of Duty: Black Ops Cold War and troubleshooting steps for technical issues
Information about what to do if you are experiencing reduced performance on the Beta version of the Battle.net Desktop App
Troubleshooting steps for disconnection problems with the Battle.net mobile app
Information on Overwatch Error (0xE01200D0).