Search for Security and Privacy, enter the main administrator password and allow the Terminal app to have access to the mouse. When you try to start the clicker, a warning should appear about Accessiblity settings. More directions if you get stuck on opening the program. Right-click, Open, and Open anyways if an error appears about this.
Ignore any warnings about developer signing.
The Auto Clicker for Intel Mac download is now available for older Intel Macs.