I am a new player of this MU game with their new season(15) and unfortunately, I got this problem with this main.exe. I've been trying different solutions from the internet(Google.com) and it seems that there is no specific solution that I can find with my problem.
I've already tried:
Run Admin, Compatibility mode, exefile from regedit, adding main.exe file from DEF, deleting unnecessary files from temp, deleting other MU game(different server)
but still, main.exe won't appear from its file. Did you guys encounter the same please help me with this if you have the same problem thank you. :(