Pro Version Fatal Error on Activate

I purchased the pro version for a site and it’s throwing a fatal error when I attempt to activate it:

Fatal error: Uncaught Error: Class 'PPRH\DAO' not found in /home/********/public_html/wp-content/plugins/pprh-pro/includes/ActivatePluginPro.php:57 Stack trace: #0 /home/********/public_html/wp-content/plugins/pprh-pro/includes/ActivatePluginPro.php(44): PPRH_PRO\ActivatePluginPro->update_table_schema(false) #1 /home/********/public_html/wp-content/plugins/pprh-pro/pprh-pro.php(160): PPRH_PRO\ActivatePluginPro->activate_plugin_init() #2 /home/********/public_html/wp-includes/class-wp-hook.php(303): PPRH_PRO\PPRH_Pro->activate_plugin('') #3 /home/********/public_html/wp-includes/class-wp-hook.php(327): WP_Hook->apply_filters('', Array) #4 /home/********/public_html/wp-includes/plugin.php(470): WP_Hook->do_action(Array) #5 /home/********/public_html/wp-admin/plugins.php(193): do_action('activate_pprh-p...') #6 {main} thrown in /home/********/public_html/wp-content/plugins/pprh-pro/includes/ActivatePluginPro.php on line 57