The message should also read 'serial number has already been registered to another email address' - check that you have entered the same email address and password that you used for the 1st install.
Hi John, thanks for the quick response. I should have said the email address I used for the first install is the only one I've used with Magix so I can't correct it. When I check my Magix account it verifies that the one I am trying to have is the correct email address. I've tried re-entering it and saving it but that didn't help.
Hey John, It just shows one. On the the other one it shows "Not in use." I have another email address I could change the my account to and try to register the second device using that. And then, change back. Would that mess anything up?
. . . . I have another email address I could change the my account to and try to register the second device using that. And then, change back. Would that mess anything up? . . . .
Probably - it may prevent licence checking and stop one of the installs working.
I would suggest you contact sales through the Support link above.