For those who are having problems with the Demo, and for others, EA has posted a solution, they are working on a permanent fix but this is it for now. If this isn't okay to post my apologies.
To protect your store content from appearing uninstalled, please follow these steps each time you launch the demo:
1. Navigate to your Documents\Electronic Arts\The Sims 3\
2. Rename the “DCCache” folder to “DCCache.bak”
You can now play your demo without it affecting your store-bought content.
When you wish to run the full game with the store content, please follow these steps each time you launch the demo:
1. Navigate to Documents\Electronic Arts\The Sims 3\
2. Delete the “DCCache” folder and rename “DCCache.bak” to “DCCache”
Now, if you’ve already downloaded the demo and your store content is missing, please follow these steps:
· If you’ve already run the demo and have not deleted your downloaded content, simply click the "Downloads" tab in your Launcher, select all and then press "Install". This will restore all of your store content.
· If you have deleted your downloads, you can also re-download from the store, free of charge.
o Go to:
https://store.thesims3.com/myAccount.html o Click on Puchase History and all the content they have bought or redeemed should be there.