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https://help.tallysolutions.com/docs/te9rel61/Licensing/Error_Code_6202.htm

Error Code 6202: Invalid Serial Number. Enter valid Serial Number to proceed.

Cause

This error occurs when you enter an invalid or incorrect serial number for activation.

Solution

You must enter a valid serial number to activate your Tally product. If the problem persists, contact the Tally partner from whom you made the purchase, or Tally Solutions for assistance.