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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/2070.html

System Requirements for Tally.Developer 2.7

Hardware

Processor

Intel Pentium III and higher

Memory

64 MB RAM or more

Free Hard Disk Space

10 MB Minimum

Monitor Resolution

800 x 600 and higher

Software

Operating System

Windows 95, 98, ME, 2000, NT, XP, or 2003

Browser (To view Help file)

Internet Explorer 4.0 or later versions.