Ambitions Expansion Pack not working from the Sims3 Commemorative Edition Box Set

I purchased the Sims3 Commemorative Edition Box Set which contains the SImS3 game as well as the Ambitions Expansion pack. The Sims3 game installs successfully but the ambitions expansion pack DVD does not install, the install wizards starts and after a while an error appears at about 80%=  CRC error . A error popsup with OK button, once you click it the wizard stops running. Tried on three different  PC's with the same result. I require the download for the Ambitions Expansion pack. Se 

Thank you.