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"Use Edit Log for transactions/masters, and digital signature for invoices/reports with Release 2.1. Download NOW!"
https://help.tallysolutions.com/docs/te9rel61/Licensing/Can_I_use_more_than_one_version_of_TE9.htm

Can I use more than one Release of Tally.ERP 9 in the same computer?

Yes, you can use more than Release of Tally.ERP 9 in the same computer.

     If you have a Silver edition license, you can use two different Releases at the same time using the Tally Gateway Server. To use multiple releases, use the License file path option to obtain the license for the releases that you want to use.

     If you have a Gold edition, you can use multiple releases at the same time.