Clicking and dragging the log file doesn't work. So one has to cut and paste it... But that doesn't work either, apparently the log is too big for a forum message. So here are the last few lines of the error log.
2021-04-23 09:33:36,643 [33] INFO (null) SolarWinds.OrionImprovement.Client.OipClient - Tracking event: Orion Falcon Installer - Installation - Installation failed. Install took 1260.6352847 seconds. - False - 1260635
2021-04-23 09:33:36,645 [33] DEBUG (null) SolarWinds.Administration.InstallExecutor.Executors.InstalledFeaturesPersistenceExecutor - Installed features persistence executor has unsubscribed
