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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/td9rel54/faq/1995.html

Can the data from Tally 7.2 containing additional UDFs be migrated to Tally 9?

Yes. Please refer to TCP Migration Help from Tally 7.2 to Tally 9 on our website https://www.tallysolutions.com/ and accordingly follow the procedure.