FTP Installation
To install the plugin from file manager you have to visit
wp-content > plugins
in your files and upload the unzipped folder into the destination. Active the plugin from the wordpress dashboard after uploading the files.

After you active the plugin, You will see a notice showing that it requires a lite version of the plugin. Which you can download from the link showed in the notice.

Install both plugins and activate them to get started using the variation features.
