A WordPress commercial (or paid) plugins require that you install them manually via File Transfer Protocol, for example. This process isn’t as simple as installing a free plugin, but WordPress will let you do what you need to do.
Install WordPress Plugins Via FTP
Follow these steps to install a plugin via FTP in your WordPress installation:
Download the plugin from the source to your computer.
Commercial plugin developers provide you with links that you can click to download the plugin files — usually, in a Zip file.
After you download the plugin to your computer, if it’s in a compressed Zip file, unzip it to access the uncompressed files.
If the file is zipped (compressed), use a free web application (such as WinZip) to unzip the plugin.
Connect to your server using your preferred FTP application.
Navigate to the wp-content folder within the WordPress installation for your website.
In the wp-content directory, find the plugins directory; upload your plugin to this location via FTP.
Congratulations — you have installed the plugin, but you still need to activate it.
Choose Plugins→Plugins on your Dashboard.
The Installing Plugin page appears.
Click the Activate link that appears below the plugin’s title.
What am I missing here? Let me know in the comments and I’ll add it in!
The upcoming blog will be on “How to Add MP3 Audio Files in WordPress” Stay Tuned!!