Go to your WordPress Admin Dashboard
Go to 'Plugins'
Go to 'Add New'
Click on 'Upload Plugin' button at top
Upload WPLegalPages zip
Click install now and activate the plugin.
The plugin is now activated.
To use WPLegalPages you need to accept the disclaimer first. Once you accept it you will redirected to General Settings.
Updating WPLegalPages to WPLegalPagesPro
To update to Pro, install the plugin that you recently purchased by extracting the zip folder of pro version in your wordpress plugins folder that is /wordpress/wp-content/plugins/
Activate it from the backend. To activate WPLegalPages Pro you need to install & activate latest free WPLegalPages plugin from wordpress.org