This was an old issue for Symantec Endpoint Encryption Management Server (SEEM) product, only the original install person can upgrade the product to the next version. We knew this issue and even opened a case with Symantec, before we ran the upgrade this time, we checked the release note and noticed it mentioned this issue was resolved, by the way, the original installer is no longer available, so we had to have another administrator to run the upgrade from 11.0.1 to 11.0.1 MP1, when we have a different administrator to run the upgrade, the error message "This product is installed for another user. Please logon as the original user in order to upgrade this product." was displayed, the person to run upgrade has the local administrator privilege, so it is not privilege issue.
Does anyone else also had such issue before and any work around you found? I hated to reinstall all the management servers.