First, I suspect it might be helpful if you were to tell us exactly which version and variant of MM you are trying to install.
The limit of 8 tracks is because the app thinks it is the "Free" version. When you say it will not let me put in the activation code can you tell us exactly where you are attempting to enter the code?
Have music maker premium 2021 I have it already installed on a computer. I’m tryin to put the program on my new computer because my old one is on its last leg.