I see it in my iphone H9 control app, but in the store both the "try" and "Buy $0.00" buttons are greyed out. Is this a case of waiting for Apple to update on their end?
You need to update the software on your H9 to install the Looper algorithm before you can try it or buy it. Click on the Pedal button in the bottom right hand corner of H9 Control and go to "Update Stompbox's Software".