You need to surrender your Tally.ERP 9 license if you want to use the license on another computer.
To surrender your Tally.ERP 9 license
1. Right-click tally.exe, and select Run as Administrator.
2. Click F12: Configure > Licensing > Surrender License.
3. Enter the Administrator e-mail ID and Tally.NET password in the Surrender License screen, as shown below:
4. Press Enter to surrender your license. A confirmation message appears once your license is surrendered.
Note: If you are surrendering your site license, you can enter the site administrator e-mail ID and password.