I see, all I can say is we've been testing on windows10 and 11 on many machines and there was no problems besides user had to unlock downloaded file sometimes because of windows protection. Also cncnet launcher devs said they've seeing that for the first time and have no idea what is the probem, they know a lot more about cncnet client than me so sadly I have no idea how to help you.
However feel free to join cnc mod haven discord server, there are all there, cncnet devs, phobos devs, kratos devs, venifera, etc. Would be higher possibility to findout the problem then.
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