Opening MacGaze the first time
macOS will refuse to open it, and then let you open it anyway. That is expected. It takes about twenty seconds and you only do it once.
Why this happens
MacGaze is currently distributed outside the Mac App Store and has not yet been notarised by Apple. Because of that, macOS blocks the first launch and asks you to confirm that you meant to open it.
This is worth being straight about: that check exists for a good reason, and MacGaze asks for your camera and permission to type on your behalf. You are being asked to take our word for it. If you would rather not, that is a completely reasonable place to stop, and the download is free precisely so you can decide after seeing it rather than before.
The short version
Drag MacGaze from the disk image into Applications, then open it. macOS will block the first launch. Approve it once from System Settings → Privacy & Security, the way you would for any app from outside the App Store, and open it again. It will not ask a second time.
Then set it up
MacGaze will ask for two permissions: the camera, to see you, and Accessibility, which is what lets it type your password at the lock screen. It cannot work without either, and both are revocable at any time from the same Privacy & Security settings.
Click the MacGaze icon in the menu bar and work down: save your login password, then set up your face. The face scan takes about a minute, and you only do it once.
You get 14 days free, everything working. If you keep it, enter your licence key from the same menu.
Stuck, or something looks wrong? Email macgazesupport@gmail.com and we'll sort it out.