Manual Installation – Pretty Links

Option #1 (Recommended)

Login to your WordPress Dashboard
If an older version of Pretty Links is installed, deactivate and delete it first
Download the latest version of Pretty Links from your account page
Go to your Dashboard -> Plugins -> Add New -> Upload page
Choose the .zip file you downloaded in step 3 above and upload it
Activate the plugin
If you're a Pro user then enter your License Key (from your account page) on Pretty Links -> Activate page to enable additional features
Done!

Option #2 (Through WebHost's File Manager):

Login to your Web Hosting Control Panel.
Find the File Manager (or similarly named) icon and open it.
Browse to the location where your WordPress website files are stored.
Find /yoursite.com/wp-content/plugins/
Once in the /plugins/ directory click "Upload" file.
Choose the pretty-link.zip file you downloaded from your account page
Upload the file, and extract it using the File Manager's unzip or extract commands.
Login to your WordPress dashboard and click on the Plugins menu.
Pretty Links should now show up in the menu.
Click Activate, and you're done!

Option #3 (Through a FTP Client):

NOTE: This tutorial assumes you know how to connect to your hosting server using an FTP client like FileZilla, FireFTP, CoreFTP, DreamWeaver, or something similar.

Download the pretty-link.zip from your account page.
Connect your FTP client to your hosting server.
Browse to /yoursite.com/wp-content/plugins/
Copy over the entire /pretty-link/ folder you extracted in step #1.
Login to your WordPress dashboard and click on the Plugins menu.
Pretty Links should now show up in the menu.
Click Activate, and you're done!