Product:
IBM Cognos Controller 10.1
Windows 7

Symptom:
When you start Cognos Controller Client (ccr.exe) you get a error message.

Error Message:
Invalid database version
This version of Controller requires database version: 851

Cause:
You have upgrade the Cognos Controller software on the server to a later version of Cognos Controller but have not upgrade the local ccr.exe client

Cognos Controller client software can work with different versions of Cognos Controller server software as long as they use the same database version.

Solution:
Uninstall the local Cognos Controller Client
Install the new Cognos Controller Client from the ccrlocalclient.msi file found on the Cognos Controller server in folder c:\Program Files (x86)\ibm\cognos\c10\webcontent\ccr

More Information:
http://www-01.ibm.com/support/docview.wss?uid=swg21367448