Hi Bernard, thanks for reporting it, and sorry for the rough start: that one was on us. The Mac version you installed wasn't notarized by Apple yet, hence « a été bloqué pour protéger votre Mac », then the app not answering.
audiolaz Room 1.3.5, out today, is notarized by Apple and opens normally. Your app offers it on its first screen (« Update now »), or download it again from your page.
The app opens in your browser at localhost:3210: everything runs on your Mac, nothing goes through the internet. Chrome's « Install » button, in the address bar, turns it into a window of its own. From there, « Start » and measure with your UMIK-1. Tell us how it sounds!