I want to activate 64 bit entitlements (i can't download the game on my mac)

k4g1ali3pd1t  Please see the accepted solution of this master thread:

Redeemed Sims 3 codes but wont download as says only available on windows? | EA Forums - 11143008

If you're still having trouble finding the live chat option, try this link:

https://help.ea.com/en/help-contact-us/?product=the-sims-3&topic=missing-game&category=manage-my-account&subcategory=find-missing-game

Make sure you're signed into an EA site (this one is fine) before clicking the link and that the location in the lower-right corner of the browser window is set to U.S. or U.K.

Alternately, try using the help site without being signed in.  Some categories of issue allow you to proceed without an active login, and many of those offer the live chat option.