First check log to find more information:
C:\Documents and Settings\<username>\Application Data\Microsoft\MSCRM\Logs
and probably you have this information:
Microsoft Dynamics CRM Data Migration Manager is either not installed, is installed for a different user, or this patch is not compatible with the version that is installed. Reasons for incompatibility include mismatched language or platform (32-bit versus 64-bit).
If you have UR7 you will need to download also DMClient from UR8
My Dynamics CRM Blog:
http://bovoweb.blogspot.com