Tried both the provided link from Safari and downloading from emu4ios.net.
The app gives me the screen above. I "continue"'d and installed the player, but the recorder app still shows that same screen, when I press continue it still brings me on the App Store page for the player even if it's already installed. In the player app there's a "get shou recorder" link that brings me back to emu4ios.net where I can reinstall it but no change, infinite loop between the 2.
EDIT: I rebooted the iPhone and now when I click continue it stopped bringing me to the App store and opened the recorder, seems OK. A glitch again...