Where to get a standalone updater for 12.2.1?

> Apple doesn’t provide downloadable standalone updaters for any version of Big Sur or Monterey. That’s because updates are now installed quite differently, and can’t use Installer packages like they do in Catalina and earlier. That’s required so the new signed and sealed System volume can be built from them. You can either download and install the update using System Prefs’ Software Update pane, or download the full installer app from the App Store. Full installers will try to connect their new System with any existing Data volume.