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https://help.tallysolutions.com/docs/te9rel61/Licensing/Error_Code_6248.htm

Error Code 6248: The Serial Number used for converting your rental license is already activated. Use a new Serial Number. Please contact your point of purchase for further assistance.

Cause

This error occurs when the serial number used for converting a rental license to regular license has already been activated on another computer.

Solution

You need to contact the Tally partner from whom you made the purchase, or Tally Solutions for assistance.