Sims 4 Birthday Update

First thing to try is to go into your game options / Sims Delivery tab and click the "Check for new Content" button. Some folks might have theirs set to "never" check and so it won't download automatically. 

 Also, as to maybe relieve some confusion, the new items do not show up as new "gold" items, like if you had just received a new pack. They are just mixed in with all the base game stuff.  Easiest method to figure out if you do have the new stuff is to go into build/buy - objects by function - "show all" and type in HBD.  You should get a smattering of doors and windows with HBD in the title if you have the new stuff.