endgame download problems

i started to download endgame yesterday from my premium game i just bought. halfway through the download my internet lost signal and i couldnt get it fixed until today. i cancelled the downloads for the maps because i had to restart my computer for the isp yesterday. now i cannot find the download anywhere and cannot play the expansions. please help. i am kinda a noob with computers and computer gaming. conquered console and wanted better graphics. i tried to reenter the code from the game but it says its already been used.lol. i hope this isnt a really stupid question