You can get the unlock key from Tally Solutions website, by providing the Tally product serial number.
To get the unlock key
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.