To upgrade your PlateSpin Server to PlateSpin Migrate 12.1, you must have an existing installation of PlateSpin Migrate 12.0 Hotfix 1. Other direct upgrades are not supported.
For information about upgrading from PlateSpin Migrate 12.0 to PlateSpin Migrate 12.0 Hotfix 1, see the PlateSpin Migrate 12.0 Hotfix 1 Release Notes. You do not need to manually run the SyncUI utility after you apply the hotfix to synchronize the differences between the Migrate Client and the Web Interface. The synchronization is performed automatically during the upgrade from PlateSpin Migrate 12.0 Hotfix 1 to PlateSpin Migrate 12.1.
For information about upgrading from prior versions to PlateSpin Migrate 12.0, see the Upgrading PlateSpin Migrate section in the PlateSpin Migrate 12.0 Installation and Upgrade Guide.