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Unlocking Tally.ERP 9 License
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https://help.tallysolutions.com/docs/te9rel52/Licensing/Unlock_License.htm

Unlocking Tally.ERP 9 License

The Tally.ERP 9 license must be unlocked with the License Key. The license key is sent to the e-mail ID of the administrator.

To unlock the license

1.     Start Tally.ERP 9.

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

3.     Enter the unlock key in the Unlock License screen, and press Enter.

A confirmation message appears once the license is unlocked.