Important! Starry Night Version 6 will not work on OS X 10.12 Sierra and higher. Please see here:
For OS X < 10.12 please see the following:
The preference files are installed during the installation, and without them there is a problem. When you open the Mac installer it says "Drag Starry Night to the Applications folder". There is a Starry Night folder, an application folder, and a triangle between them. Take the Starry Night folder and drag it across the triangle and into the Application s folder. After it finishes the installation, go to your Applications folder and double click the Starry Night application to start the program. Everything should work right.
Mac installation instructions:
A window will open with the Starry Night program on the left side, the Mac Applications folder on the right side, and a triangle between the two. To install, you simply drag the Starry Night program over the triangle and onto the Applications folder.
Starry Night will be installed in the Applications folder. Run the Starry Night program and register when prompted.