In case you are a Single-Site setup, the Add-on will be installed and activated automatically. If this does not happen, please click herefor simple steps on how to do so.
In case you are part of a Multi-Site setup, you will need to configure Tally.ERP 9 to activate the Add-on. Click herefor an explanation.
How will you know if you are operating as a Single Site or Multi Site?
Look at the Tally.ERP 9 Information Bar. If you see:
Only "Account ID": you are operating a
Single-Site setup,
"Site ID" & "Account ID": you are operating in a Multi-Site setup
for simple steps on how to do so.