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"Use Edit Log for transactions/masters, and digital signature for invoices/reports with Release 2.1. Download NOW!"
https://help.tallysolutions.com/docs/te9rel66/Licensing/hardlock_to_softlock.htm

Convert or Upgrade from Tally 6.3/7.2 Hard Lock to Tally.ERP 9 Soft Lock?

You can upgrade or convert Tally 6.3/7.2 to Tally.ERP 9 through online portal using debit/credit card or net banking facility .

1. Enter the relevant details on the portal.

2. Enter the billing details.

3. Make the payment.

You can also contact your Tally Partner to upgrade to the latest release.