v2.0 fixes “wp_get_current_user” in the worst way possible

What you did is basically this:

if (!function_exists('wp_get_current_user')) {
	require_once(ABSPATH . "wp-includes/pluggable.php");
}

– which works, but if there’s anything that tries to load it later, you’ll get a fatal on function redefinition.

A better way to fix the issue is to change this:

if (is_admin() or is_super_admin()) {
	// add_action('admin_enqueue_scripts', 'restore_classic_load_upsell');
	add_action('wp_ajax_restore_install_plugin2', 'restore_install_plugin2');
	add_action('wp_ajax_nopriv_restore_install_plugin2', 'restore_install_plugin2');
 }

to this:

add_action('init', function(){if (is_admin() or is_super_admin()) {
	// add_action('admin_enqueue_scripts', 'restore_classic_load_upsell');
	add_action('wp_ajax_restore_install_plugin2', 'restore_install_plugin2');
	add_action('wp_ajax_nopriv_restore_install_plugin2', 'restore_install_plugin2');
 }});