I won an account with GTA 4 bought via games on demand, i went to the page and downloaded it like i normally would, i downloaded it and when i go to my games library its not there, i go to my memory and go to gta 4 and it says its corrupt yet i finished the download and have room for it

Yes i downloaded it from the account that its bought on, yes i am trying to play it on the account i downloaded it from and bought it from

Please if you know how to fix it let me know