How to download the Sims 3 generations [ Edited ]

[Tee1146]

I purchased the Sims 3 generations for my Mac and every time I try to download the game I get an error message saying

Download expired or invalid. Please restart your download by logging in to your GameTree Mac account at  http://gametreemac.com and selecting your order.

I followed the instructions five times and no download so can someone please help me because I don't have 40 dollars to waists 

thank you very much

(edit: removed email for security reasons)

[EA_Spectre]

I moved this thread to the Sims board.