The best option is to purchase a license from Tally Solutions or an authorized reseller. This will provide you with a valid serial key and activation key and ensure that you can use the software without any limitations.
Tally ERP 9 Serial Key and Activation Key Free: A Comprehensive Guide**
Without a valid serial key and activation key, users will not be able to use Tally ERP 9. The software will display a warning message and will not allow users to access its features.