https://help.tallysolutions.com/docs/ts9rel54/ts9/installing_tallyserver9_and_licensing.htm

Installation and Licensing - Tally.Server 9

You can install Tally.Server 9 from the Downloads page on the Tally website. You can also install Tally.Server 9 using the CD installer.

A new customer of Tally.ERP 9 with Tally.Server 9 will need two installers - Tally.ERP 9 Series A Release 5.X installer and Tally.Server 9 Release 5.X installer .

Click the following links for more information:

Installing Tally.Server 9

Activating Tally.Server 9 license

Activating Tally.Server 9 License as a Multi-Site Account

Reactivating Tally.Server 9 License

Updating Tally.Server 9 License

Surrendering Tally.Server 9 License

Configuring Tally.Server 9 License