Apptivo e-Commerce Plugin

Hi there,

I have succesfully download ver 1.1.2. The link as below.
https://downloads.www.ads-software.com/plugin/apptivo-ecommerce.latest-stable.zip

After download, how to activate the plugin. What I got is the there is a folder in zip file and I have extracted all the file. Some of the file is in php.

Can u tell me how to activate or what to do next.

https://www.ads-software.com/plugins/apptivo-ecommerce/