They are planning on dropping the Paid For app.

The trial app will keep having 'things' added, eg different cache types, and further 'options' will be opened on the app to users who pay for Premium Membership...

I think they are working on what they started with the windoze phone app, eg., shows minimum, until you 'upgrade' to Premium, then you can see everything.

Hence no Updates to the paid for app, and it will be dropped eventually. 

(A BAD move, in my opinion.)