i have purchased the sims 3 starter pack with disc.. but want to download it to my macbook air which has no disc drive..
There are usb dvd drives but installing TS3 that way requires you to have the usb drive connected to play the game. You can get the digital download version (free) with the disc code. You need to download Origin - link - Origin and below the orange button click download for mac. Intall Origin and register the game/pack and then you should be able to download and install the games.
@luciaxkrohn The disc code is the 20-character code that you use to install the base game or a pack. You can find it printed on the back of the insert that came inside your CD case.
If you're having trouble registering or installing your game, please describe the problem in more detail, and I'll try to help.