Transform your Dock with a vintage aesthetic.
The installation process of Slick Retro is extremely easy to follow. Simply go to Macintosh HD > /System/Library/Core Services/ and right-click on "Dock." From there, select "Show Package Contents" and navigate to /Contents/Resources/.
Before replacing anything, it is highly recommended that you backup the original files that you are about to replace. Once you have done so, delete the original files by moving them to the trash.
Finally, move the files you downloaded into the Resources folder, open Terminal and type "killall Dock" (without the quotes) to bring up the new dock. With Slick Retro, you can enjoy a unique and classic desktop interface without any hassle.