You can get the unlock key from Tally Solutions website, by providing the Tally product serial number.
1. Go to Tally Solutions website.
2. Click SUPPORT > TallyHelp .
3. Scroll down, and click Get Unlock Key for product activation . The Unlock Key Service screen appears.
4. Enter the Tally product serial number, and click Get Unlock Key . The unlock key for your Tally Product serial number will be displayed.
You can use this key to unlock and use your Tally product.