Sandip looks at an upgrade problem and how the DUinstall.log file helped with troubleshooting in his incredibly long titled post: There was a problem ascertaining product version information. Microsoft Dynamics GP Utilities will now exit. Check DUinstall.log for more information.
Upgrades and the DUinstall.log
Archived post from 2010. Dynamics GP and the links it points to have changed since; check current documentation before relying on version-specific steps.