Installation issues

I recently purchased the instant download edition of  The Sims 3: University Life expansion pack from the game.co.uk website. I tried to install it and repeatedly received the same error message which prevents me from installing it successfully. The message reads:
"Setup needs the next disk
Please insert disk 1 that contains the file Thumbnails\AllThumbnails.package"
I have tried to find the right file on all of my Sims 3 expansion pack disks, and the original game but have not yet been successful. 

Any idea where the right files are located? 

Thanks