Since the upgrade was completed, they receive an error message in event viewer from AutoUpgradeLoggerTask every 5 minutes.
There are two Windows Scheduled Tasks that are involved with the bootstrapper upgrade of the Connector. These can be viewed in the Task Scheduler UI in Windows.
Admins can temporarily disable the AutoUpdateLoggerTask to reduce the amount of error messages. This will not impact automatic Connector upgrades.
Even when disabled, the Connector re-enables AutoUpdateLoggerTask and AutoUpdateTask right before the start of the next upgrade and the process completes successfully.
This is a known issue which will be resolved in an upcoming release of the Cloud Connector.