https://help.tallysolutions.com/docs/te9rel51/Data_Migration/Upgrading_to_TE9_Release_5.htm
Upgrading to Tally.ERP 9 Release 5.0
To upgrade to Tally.ERP 9 Release 5.0
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Download Tally.ERP 9 Release 5.0.
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Install Tally.ERP 9 Release 5.0 on your system.
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Backup your data before migrating to Tally.ERP 9 Release 5.0.
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Migrate or move your data to Tally.ERP 9 Release 5.0.
'Upgrading to Tally.ERP 9 Release 5.5' has been shared with