Holler Box Installation
Visit your WordPress admin, Plugins => add new, search for Holler Box. Install and activate this plugin. You can also download it here.
Holler Box Pro Installation
Download the .zip file from your receipt email or account page.
Upload the plugin zip file in your WordPress admin under Plugins => Add New => Upload. Activate the plugin.
Pro License Key
Visit the Holler Box settings page to add your license key. Find your license key in your receipt email or on your account page.
Enter your license key into the settings field and save. Next, click "Activate license."
If you see a green line underneath your key, your site has been activated. You will now receive automatic updates.
You can activate your key on a development site without it counting against your total.
To deactivate your key, press Deactivate license.