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https://help.tallysolutions.com/docs/te9rel64/Installation/Installing_Product_Help_Error.htm

Could not install product help

Cause

Installation of the product help can fail if the installer is corrupt, or when old help files in the installation folder are already open, and in use.

Solution

Close all instances of the help file that may be open and reinstall the help. If the installation fails again, download a new help installer from the download center, and retry.