Attempting to upgrade from 12.2.0.9303 to 12.3. The install gets to about 11% in the progress bar and fails with error:
Failed to install service 'service.SpotlightDiagnosticServer'
The installer closes. No rollback is performed. No install log file can be found indicating what the problem is. Spotlight appears to be in an unrecoverable half-installed state after this. Installation attempt does not even register that a prior installation was present.
If chosen to install using the existing directories and databases, it appears to install correctly but the Diagnostic Server Service won't stay started and the client states that no Diagnostic Server is installed. Able to revert to snapshot on VM back to recover the previous version Diagnostic Server.