The initial set-up fee for Premier is non-refundable since it provides the ability to download the add-ons which is then installed on your site. We had too many dishonest web designers buying it, using the add-ons for multiple clients (and we assume being paid a hefty fee for developing their customers sites) and then cancelling it and keeping the downloads.
We have a demo site but have been having issues with the Ninja plugin that developer demo sites. The demo site is built on top of the now-defunct Ninja Forms app called “Ninja Demo”. The demo site therefore does not have the latest Premier features.