When doing an AdminUI upgrade, the installer doesn't ask to do an upgrade, and it proceeds to do a fresh install directly.
Why this behavior if the AdminUI is already installed?
This behavior when the installer does not see entries for AdminUI prerequisites nor AdminUI on file:
Re-install the original version for both AdminUI prerequisites and AdminUI, following the documentation.
After the install, verify that both AdminUI prerequisites and AdminUI have entries in /var/.com.zerog.registry.xml
Then, upgrade the AdminUI prerequisites and AdminUI.
An AdminUI registration might be needed with the Policy Server.