Open System Preferences (click on the Apple logo).
Click on Security & Privacy.
From the General tab, under Allow apps downloaded from, click Open Anyway next to the “WatchFaceStudio.pkg was blocked from use because it is not from an identified developer.”
A window displays the message “macOS cannot verify the developer of WatchFaceStudio.pkg. Are you sure you want to open it?” Click Open to install Watch Face Studio.
Could you please share where you get this suggestion?