bradmacpro

This happens when you get a new Mac, but with slightly older software installed. You have to sign in with your Apple ID in the iCloud System Preferences and in the App Store, then you can proceed with the System Updates from Software Update System Preferences and the application updates from the App Store. I also had this dilemma of no Accept in some cases and as they are all free apps, I deleted them in the Finder, the update need disappeared from the App Store - Updates page and I then switched to discover and used the search to find iMovie, Pages, Keynote, Numbers, GarageBand and it shows as a iCloud download icon perhaps or just the usual Get for free applications. Download and install and you're good to go.

This is all based on an old patent of Apple's, where they considered a stackable design. People want to be able to put in their own full size PCIe 3.0 video card, and memory and storage and this plan won't allow that. It learns little from Apple's failures with the current Mac Pro design.