May 2015
I saved my serial code awhile ago just in case i wanted to play the game again. Unfortunately in that time i lost the disc and had uninstalled the game. I tried putting my serial code into the redeem product code thing. ( https://account.origin.com/cp-ui/redemption/index?gameId=ebisu&gameId=ebisu&locale=en_US )
But it says my code has been used. My sims 3 game also came with expansion pack sims 3 supernatural disc (and i have its serial code) but to even play that it says i must download sims 3 first ( the lost disc). Help?
May 2015
make sure to uninstall the disk version of whichever game it is your missing before downloading and installing the digital version and back up your stuff first just in case
http://sims3.crinrict.com/en/2011/03/faq-what-files-should-i-backup.html
For Origin
You don't need to re-register again. Simply log in with your Origin account from the desktop shortcut of origin the origin you download with the email and password you use for your account my games tab right click the game icon download If it's not there anymore, contact a game adviser
https://www.origin.com/en-us/download
Installation window installing/reinstalling via disks contact CS
http://help.ea.com/en/article/contact-ea-help/