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https://help.tallysolutions.com/docs/td9rel54/faq/3018.html

The installation file is infected with virus

In the process of trying to download the TallyDeveloper installation file (TallyDeveloperSetup.exe) from the website, the anti-virus software (NOD32, etc) displays a virus alert message stating that the installation file is infected with a virus.

Cause

It can be due to false alarms from the anti-virus software or due to the virus infected in your machine.

Solution

You can send the TallyDeveloperSetup.exe file to your anti-virus vendors for a confirmation.