Step 1 – Installing the Premium Version plugin.
Once you have downloaded Sola Testimonials plugin from wordpress.org, you should be able to upload the zip file to the wp-admin section under Plugins -> Add New -> Upload. Once uploaded, please ensure that you have activated the plugin. Please also ensure that you have both basic and premium versions installed as the premium version is an add-on to the basic version.
See below an illustration of how to navigate through to the appropriate page.