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https://help.tallysolutions.com/docs/td9rel54/td9/working_with_projects/tcps_support_earlier_versions_of_te9.htm

Generating Irreversible TCPs to Support Earlier Versions of Tally.ERP 9

You can build irreversible TCPs which are supported by earlier releases of Tally.ERP 9 Release 5.4.

To build irreversible TCPs

1. Load the earlier releases of default TDL (tdlserver.dll).

2. Generate the TCPs by selecting Irreversible under Compilation Formats .