Had the same issue. Reverting to previous version solved the issue.
Error message:
Uncaught Error: Class ‘Permalink_Manager_Pro_Addons’ not found in C:\xampp\htdocs\wordpress\wp-content\plugins\permalink-manager\includes\core\permalink-manager-admin-functions.php:913
Stack trace:
#0 C:\xampp\htdocs\wordpress\wp-content\plugins\permalink-manager\includes\core\permalink-manager-admin-functions.php(876): Permalink_Manager_Admin_Functions::display_redirect_panel(56916)
#1 C:\xampp\htdocs\wordpress\wp-content\plugins\permalink-manager\includes\core\permalink-manager-uri-functions-post.php(630): Permalink_Manager_Admin_Functions::display_uri_box(Object(WP_Post))
#2 C:\xampp\htdocs\wordpress\wp-includes\class-wp-hook.php(286): Permalink_Manager_URI_Functions_Post->edit_uri_box(‘Permali…’, 56916, NULL, NULL, Object(WP_Post))
#3 C:\xampp\htdocs\wordpress\wp-includes\plugin.php(208): WP_Hook->apply_filters(‘Permali…’, Array)
#4 C:\xampp\htdocs\wordpress\wp-admin\includes\post.php(1468): apply_filters(‘get_sample_perm…’, ‘Permali…’, 56916, NULL, NULL, Object(WP_Post)) #