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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/6117.html

Compiling TCP file for Tally9/Tally 7.2 using Tally.Developer9

Tally.Developer 9 generates TCP of the latest encryption format, which is compatible only for Tally.ERP 9. In case you need to make a TCP file for version Tally 9 and Tally 7.2 you need to make use of Tally Developer 2.7.