Yosemite 10.10.3 Beta not showing up on older MacBook Pro?

I have two MacBooks - both running the latest 10.10.2. One is a newer MacBookPro11,3 and the older one is a MacBookPro8,2.

I have enabled beta software on both laptops but the 10.10.3 update only shows on the newer MacBook. Is there any change in requirements that would exclude the older MacBook or some other possible issue?

I have tried:

1. Restarting.


2. Resetting the PRAM.


3. Deactivating beta updates, then installing it again.


4. Waiting a few hours.

App Store still shows "No updates available" on the older MacBook...