I just installed 5.3 in my test environment over an existing 5.1 installation. When I try to run the Import Tool from within the Data Dictionary tool, I get an error ‘Import Wizard plugin not installed’. I did run the database management console and upgrade my database – it now reports version 1.5.5. I also received an error during the install about needing to uninstall the email service.
You need to manually uninstall the Email Service on Control Panel>Add/Remove. IS released two DBMC for SP5.1 (1.5.1, 1.5.2) and two DBMC for SP5.2 (1.5.3,1.5.4); 1.5.5 is correct for SP5.3.