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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/te9rel60/release_notes_6_0/release_6_0_1.htm

Release Notes for Tally.ERP 9 Release 6.0.1

 We recommend that you install Tally.ERP 9 Release 6.0.1 which addresses an MAV error reported by a few users. This error occurred while trying to select a company.