Ultimate Social is a premium plugin for WordPress. This means that you have to purchase and download it from CodeCanyon. Once you have it downloaded and unpacked you will find a file called ultimate-social-deux.zip, you need this file.
Now hover over the Plugins tab in your WordPress Dashboard and click “Add new”. Now click “Upload” and upload the file from before to your WordPress Installation.
Once uploaded you will be asked to active it. Go ahead and do that and you are all set.