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https://help.tallysolutions.com/docs/ts9rel54/ts9/unlocking_licenses.htm

Unlocking Tally.Server 9 License

To obtain the license, the license file has to be unlocked by providing the License Key. The license key is sent to the e-mail ID of the administrator.

To unlock the license

1. Start Tally.Server 9 .

2. Click N : Unlock License in the Startup screen.

3. E nter the unlock key in t he Unlock License screen, and press Enter .  A confirmation message appears once the license is unlocked.