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Error: "Application is not licensed to run this feature"

Question:

"Application is not licensed to run this feature" error when running demo application from \demos\db\clientds.

Answer:

This error occurs when attempting to use Delphi 3 Client/Server features from Delphi 3 Professional or Standard editions. This could happen if you compiled the demos using a compiler other than the one that comes with Delphi 3 C/S. Check that the Delphi 3 Professional was not installed previously without first being un-installed. To correct this situation, uninstall Delphi, double check for leftover Delphi files, and finally reinstall Delphi 3.0 C/S.