Step 1: Download the extension on the desktop. Open Chrome, click on vertical ellipsis menu button at the top-right corner and select More tools > Extensions.
Note: You can go to the extensions page by inputting "chrome://extensions" directly in the address bar.
Step 2: On the Chrome extension page, turn on "Developer mode"
Step 3: Double click on the extension.zip file to unzip it into a folder named Extension.
Download the yuuppy.zip file.
Step 4: On Chrome's Extension Management page, click the Load unpacked extension button and select the unzipped folder for your extension to install it.