Download & install TallyPrime (for those who already have Tally.ERP 9) – https://youtu.be/0kou1KSWiXw
Activate new license in TallyPrime – https://youtu.be/0H1y94Cg9Ks
Reactivate an existing license of Tally.ERP 9 into TallyPrime – https://youtu.be/ZsplqFKTqRc