For a couple of months now, I have been running into problems downloading 3rd party maps in these games. The network connections would just time out. I finally tracked down the root cause. If anyone else is hitting this problem, turn off iCloud Private Relay. It appear to block outbound traffic on port 80 (insecure HTTP). I see this in macOS Monterey (12.2). I hear it may be fixed in 12.3, but I'm not running it yet. Private Relay is still a beta feature, so I guess this is just growing pains. An alternative is to run a proxy like Proxyman or Charles Proxy when you are running the game. They seem to be able to get around the bug since they are network diagnostic utilities.
Thank you for sharing this information with the Apple/Mac community.