I went ahead and blocked the first executable and then both, but the issue persists. After I read your message I was kicking myself for not thinking of this myself, I was really surprised to see the issue even with these rules in place. I've attached some screenshots as proof that I did setup the rules!

For me, playing the game with the wireless turned off is not a big deal. I can still eyeball mail and stuff on my phone.

Thank you for looking into this issue, I appreciate it. :-)

WFTO-firewall-2.png
WFTO-firewall-1.png

War for the Overworld Launcher Log.txt

output_log.txt

I installed the game with the GOG Galaxy Client and it appears to have the same issue. I start the game and the splash screen appears, then the game exits. In the Galaxy client the play button switches from gray to purple, indicating (I think) that it thinks the game exited normally.

I have attached the output and launcher logs and will give the offline installer a try. :-)

Thank you for the copy of the game! :-D

output_log.txt
War for the Overworld Launcher Log.txt

I tried placing Steam in "offline" mode but the game still doesn't launch. :-(

Attached are the output and launcher log files.

Log Files

Your suspicion was correct: the game runs with the WiFi adapter disabled. Attached is a ZIP archive with the DXDiag report as well as the output.log and launcher.log files for all three scenarios.

Thank you!

War for the Overworld - Diagnostics.zip