Click the Download for Mac link. The software will begin downloading. Click on the download icon in the upper-right corner of your browser after download completes. Open and run the file.

Run installation. Once complete, click Finish.

You will be taken to this page after the installation. Click on the Night Shift icon to open the application launch. Then click Open Link.

To start the software in the future, you just need to double click the icon on your desktop.