Available in your plan / Apps to try

Hi

Recently, on my Creative Cloud Desktop account, within the "Available in your plan"section, Adobe Muse CC appeared with a single button to "Install".

It is NOT listed in the section "Apps to try" that each have a button option to "Try" or "Buy".

Why therefore after opting to install it, am I presented with a dialog to sign in with my Adobe Id and then opt to either "Trial" or "Purchase" the software?

Why is it listed as available in my plan for it then to request a purchase to be made?