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https://help.tallysolutions.com/docs/ts9rel54/faq/7876.html

Incompatible version of Tally.Server 9 used with Tally.ERP 9

Tally.ERP 9 Series A Release 4.51 will crash with the following error message if Tally.Server 9 Release 4.5 is used for data sharing:

Upgrade to Tally.Server 9 Release 4.51 to continue working on Tally.Server 9 data.

Incompatible version of License Server

The following message will be displayed in Tally.ERP 9 Series A Release 4.5/4.51 if Tally.Server 9 Release 4.51 is used alongside License Server 7.8:

Upgrade to License Server 7.9 for smooth operations.

Incompatible version of Tally.Server 9 used with License Server 7.9

The following error message will be displayed in Tally.ERP 9 if Tally.Server 9 Release 4.5 is used alongside License Server 7.9:

Upgrade to Tally.Server 9 Release 4.51 for smooth operations.