Support for Smart Click

Is Smart Click no longer supported on iOS? It looks like a great metronome, so I downloaded onto my iPhone 11 Pro Max, running iOS 18.3.1. After two clicks it immediately reverts to 120 bpm. At this point, none of the buttons function, and the click does not stop for almost a minute after closing the app. A reboot made no difference. According to the app store, Smart Click hasn’t been updated in seven years, but I find no information on this forum about the app. It is still advertised on the Steinberg website.