i had the same problem before, i had ddnet v14 installed
when i tried to update to v15 the same thing happened
i remmeber i tried to download loads of diferent versions to see if the problem was with v15, but all had the same problem!
even if i downloaded the same version i was using, straight from the website, i had the same problem
i could only play with the that folder i already had installed
not that i formated my pc, nothing works