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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_4/whats_new_in_release549.htm

What's New in Tally.Developer 9 Release 5.4.9

On searching for a string on Tally.Developer 9, with the options Search in Strings and Tally Search enabled, the application was crashing if the search fetched many results.

This issue is resolved.