Lost registration code for sims medieval

[Vaye122]

I recently bought the Sims Medieval at a thrift store in great condition. While I was setting it up on my Mac at home it said to put the registration code in that you can find on the manual or back of the CD case. There was no manual in the DVD case, so I just looked at the back of the case, I couldn't find one on there so I assumed that the manual was lost or thrown away by the previous owners of the game. Is there any way I can get the game up and running, or a way to find the lost code?