Sorry for the late response, and Thanks for wishing us a happy Eid, much appreciated.
You would not need to enter the licence key anywhere in WordPress, you can use to get automatic updates with the Envato WordPress Toolkit (https://github.com/envato/envato-wordpress-toolkit) but that’s up to you.
We can help you get the demo pages (all of them, or only the ones you want) or you can try it out yourself
if you want to give it a go yourself, please check the page http://docs.creiden.com/circleflip/installations/demo-content-installation/
Otherwise, please send us your access credentials and let us know which pages (or all of them) you need.