does it happen in the base game (Forged Alliance without FAF)?
can you post some logs (from a game where you had the issue)?
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always post the entire error message in text form instead of making a screenshot of a fraction of the error message
also post the complete game and client log
uninstall the client and wipe the install folder in case anything is left after the uninstall
then install again and hope that your OS didn't remember you wanting to run the app with admin perms for some reason
your windows user may be an admin but that doesn't mean that you are executing anything as admin (you still get a prompt if something needs admin rights in windows unless you disabled the user account control in windows)
also don't run stuff as admin unless you know what you're doing
your friend should post his game and client log
Caused by: java.nio.file.FileSystemException: C:\ProgramData\FAForever\bin\BsSndRpt.exe: Процесс не может получить доступ к файлу, так как этот файл занят другим процессом.
(google Translate) ->
The process cannot access the file because the file is occupied by another process
i'd start with checking if you have write permissions issues in C:\ProgramData\FAForever\bin or if you had the client running a 2nd time
2020-08-18 00:09:15.955 WARN 13140 --- [JavaFX Application Thread] c.faforever.client.coop.CoopController : No coop mission found for folder name: nmca_002
I suggest you delete the nmca_002 folder in %userprofile%\Documents\My Games\Gas Powered Games\Supreme Commander Forged Alliance\maps