Paid add-ons are provided as zip-archives. To install an add-on, you should download it first. Click the download link, which you’ve received after purchase and download zip-archive with the required add-on. Then follow the instructions below.
Go to Dashboard → Plugins → Add new page and press the Add New button;
Press Upload Plugin at the top of the screen;
Select downloaded zip-archive with add-on on the opened page and press Install Now button;
Wait until the installation is completed and press Activate Plugin link.
Installation through FTP
Take the following steps to install add-on through FTP:
Unzip the downloaded archive using an archiver app;
Copy unpacked folder with add-on to FTP server, to /wp-content/plugins/ folder; As a result, the path to add-on folder should look like: /wp-content/plugins/shortcodes-ultimate-extra/;
Go to Dashboard → Plugins page;
If you made everything correctly in step 2, a new add-on will appear in plugin list;
Press the Activate link near the add-on to activate it.