Step 0. Purchase GP Premium ($49/year)
Step 1. Download GP Premium
Log in to GeneratePress.com
Next, enter your login detail
Next, click on Download
Step 2. Installing GP Premium
GP Premium is PLUGIN, not THEME
Next, Choose File > Install Now
Next, Activate Plugin
Step 3. Activating GP License
Appearance > GeneratePress > Enter your license Key > Save
GP Premium has a lot of modules. And you want to use, just activate module.
With WooCommerce Module, you need to install WooCommerce plugin!