I don't know if there is anywhere to add the serial number after you have installed it (I have never had to do that).
But as you install it shoulld ask you if you have a serial number or a hardware key.
Make sure you choose the serial number.
I'm not sure but it may also ask if you want to install the student (educational), demo or professional version.
Barry.
One of the forum moderators.
Versions 6.5 to 27
i7-10700 @ 2.9Ghz, 32GB ram, GeForce RTX 2060 (6GB), Windows 10
Lenovo Thinkpad - i7-1270P 2.20 GHz, 32GB RAM, Nvidia T550, Windows 11