Hi
How long are you waiting? Sometimes the bar does seem to be stuck for ages, but then it suddenly starts moving again if you leave it for a while.
If you wait ages and can't make progress, it is possible that your download from Origin is corrupt. This seems to happen quite often. You would need to delete the Origin client and get rid of the The Sims 3 files from your computer, then start again. I will paste below some directions for using Origin.
Caspin
To download and install games through Origin:
First install the Origin client for Mac and make sure it is up-to-date. The latest version can be downloaded from here: http://www.dm.origin.com/mac/download
Additional advice on how to download games (thank you Tremayne for this tip):
When downloading from Origin, do NOT use the first install icon. Move your cursor over the game cover and click on the information (letter i) and then click on the install button from there. For some reason, downloads from Origin frequently become corrupted. Using the i reduces the chance of your download being corrupted. If you have already been unfortunate and have a corrupted download, then it is important to remove all traces of this before trying again, by doing a thorough, clean uninstallation first.
Are you running anti-virus software or any clean-up applications? If so, disable these, as they might be deleting files that Origin needs!
