bc eac couldn’t update (from reading the error message)
As the other guy said, EAC has an issue.
With the game closed, verify you have your game folder excluded from the anti-virus, and windows defender. Repair the EAC service by going into the warthunder folder, in there is an EAC folder, run the setup in there as admin, an repair service.
Then start the game and it should handle it a bit better.
If it doesn’t from there, check the firewall settings on your PC allows war thunder, and from there check your network location is set to private, not public as sometimes it ends up being.