Unity Express Upgrade Failure

Hit an odd error when attempting to upgrade Unity Express 8.5.1 to 8.6.7 where it downloaded part of the files & choked with the error message "Error: Required Subsystem ID e2497725-368d-48b5-a7d5-7f87d889a608 was not found either on Installed or Candidate list.". There's a known bug (CSCtd56585) that causes this error, but Cisco's documentation says the conditions are:

1) Cisco Unity Express was shipped from Cisco with version 7.0.1 or later

2) One of the following upgrades is done

– 7.0.x to 7.1.

– 7.0.x to 8.0.

– 7.1.x to 8.0.x

Given that this was CUE 8.5.1 running on an SRE, it doesn't match the criteria. Fortunately the workaround does still work - use the CUE CLI command software uninstall uid-list 26bd663c-3e5a-43d9-a6c3-5441ce44941b & once it has finished rebooting you can proceed the with the upgrade.