You require to update the license information, when the TDL/General configuration assigned to the account has to be applied to the respective site or when you renew/subscribe for Tally.NET. The procedure to update a Tally.ERP 9 license for Single Site and Multi Site is similar
To update the License follow the steps shown:
From the Gateway of Tally or Company Info menu
Press F12: Configure.
Select Licensing > Update License.
The Login as Remote Tally.NET User screen appears.
Enter your E-Mail ID in Your E-Mail ID field.
Enter your Tally.NET Password in Your Tally.NET Password field.
Accept to update the license
Tally.ERP 9 displays the message License Updated Successfully!