Mac Client Release Notes
If the download does not start automatically you can click here to download v3.0.2.
Open the DMG, then double click to install (requires 64-bit OSX 10.6 to 10.14). It should select itself as your current screensaver, or you can open the System Preferences / Desktop & Screensaver and choose "Electric Sheep" from the list on the left.
On more recent versions of OSX starting with Catalina, installation is the same and the application works fine when started manually. However, when run as a screensaver downloading and voting is blocked.
If you have trouble, see the help page.