That’s strange, the database upgrade should have installed the form if the it did complete. I’ve run multple tests I’m even using the plugin on wpusermanager.com with no issues.
Anyways, if there’s no form in the editor it should mean the database upgrade didn’t complete correctly.
A quick fix would be to force the installation of the form. To do so, add this snippet to your theme’s functions.php file
function wpum_pekos_fix() {
if ( isset( $_GET['pekos'] ) && is_admin() && current_user_can( 'manage_options' ) ) {
wpum_install_registration_form();
wp_die('Done');
}
}
add_action( 'admin_init', 'wpum_pekos_fix' );
Now login as an admin onto your site, and within your dashboard, append ?pekos to your site url so for example it’ll be https://www.example.com/?pekos
It’ll run the registration form installation function and you should see a message after that. You can remove the snippet from your functions.php file after.
Let me know if that fixes the issue.