While attempting to import a vCenter VCSA ISO file or Update Bundle file into Lifecycle Manager, one of the following error messages is received:
VMware vSphere Lifecycle Manager had an unknown error. Check the events and log files for details.An unexpected error has occurred.Files such as the following that are used for deploying a new vCenter, upgrading a vCenter, or updating/patching a vCenter are not intended to be imported into Lifecycle Manager.
Lifecycle Manager is used for managing the lifecycle of vSphere components, however it is not used for deploying, updating or upgrading a vCenter.
In order to patch/update a vCenter to a later build of 8.x, use the steps detailed in KB article 316584:
In order to upgrade a vCenter from 7.x to 8.x, use the steps detailed in KB article 372863: