I manage two Drupal-based web sites installed on distant servers on which I do not have the rights to run composer (or drush). The only possibility for me to apply updates/upgrades is to download the last version of Drupal, unpack the archive, locally apply patches and then manually transfer the files to the servers.
I upgraded on of the two site from Drupal 10.3 to 10.4 this morning and encountered the problem reported in this thread. I applied the patch "3494938-restore-admin-modules-themes-route.patch" to the local files and transferred the patched files, run update.php and clear caches but the problem is still present.
I tried to apply the patch "3494938-add-report-module-and-theme-to-routes.patch" but I got the following error message "error: modules/update/src/Routing/UpdateRouteSubscriber.php: No file or forlder with this name"
Can someone explain me the procedure I should follow to update my sites (manually) ? Thank you.