I have a similar question, however I want it to be installed and activated on two different hard-disk's, however on the same computer.
The reason being is that I have a dual boot computer, one with windows 10 and FSX installed, the other one with windows 11 and MSFS installed.
So I can boot my computer in the OS I want depending if I want to use FSX or MSFS. I know I should probably de-activate PF3 on one OS and re-activate on the other and visa versa depending what FS I want to fly with. I'm not in the 70's yet but getting close so you know for a fact I will forget and have to reboot and do the whole procedure.

Would it not be possible to have the activation done in a way that, if in the same computer, PF3 can be run on either HDD? Clearly I wouldn't be able to run the two simultaneously as they are in the same computer.
Cheers,
Luc