Since the official website now promotes TallyPrime, you must navigate to the archives to find this specific legacy version.

: Choose Tally.ERP 9 Release 6.6.3 from the dropdown menu and click Install .

To ensure the software runs smoothly on your Windows PC, verify these minimum specifications:

Tally.ERP 9 Release 6.6.3: Installation and Activation Guide

: Trusted third-party mirrors like FileHorse or FileHippo also host archived setup files for this specific version. System Requirements for Release 6.6.3

Download TallyPrime Support Files, Lastest to Previous Version

: Go to the Tally Solutions Download Support Files page.