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Your licensing activities are just so simple. Activate your new license, reactivate your existing license, or update your license info with the click of a button, right from the Manage License screen.
https://help.tallysolutions.com/docs/ts9rel54/ts9/licensing_operations.htm

Licensing operations from Tally.Server 9

The Tally.Server 9 License can be managed from the Tally.Server 9 Monitor.

From Company View or User View , click S : Manage Server or press Alt + S.

Click F3 : Licensing or press F3 to perform the following operations.

o Update License

o Surrender License or Reactivate License

o Configure Existing License