I purchased the Litchi app last year, and after a few months did not really like it. I uninstalled it from the then iPad mini2 I had. I thought I would give it another try on either my iPad Mini4 or the Pro. The issue is when I go to the Apple Store it says I need to purchase it. I'm afraid to hit the "Purchase" button in case it actually bills me the $27. Shouldn't it download to my iPad for free ???