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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/td9/release_notes/release_5_5/whats_new_in_release553.htm

What's New in Tally.Developer 9 Release 5.5.3

Tally.Developer 9 is enhanced to run as a 64-bit native application. Now, it automatically installs 32-bit or 64-bit Tally.Developer 9 application, depending on your system bitness.

On a 64-bit system, Tally.Developer 9 64-bit application supports the SDK of Tally.ERP 9 Release 5.5.3 and later.

For more information, click here .