The 10.15.7 installer is relevant for the following hardware, which cannot upgrade to Big Sur, Monterey, or Ventura:
If the App Store link fails or you are managing multiple machines, use the terminal: macos catalina 10157 installer upd
A: Yes, but only by wiping the drive. Catalina cannot be installed over Monterey without erasing. Backup your data, create a bootable USB, erase the Mac, then install Catalina fresh. The 10