I try to register my SW for Samplitude SE No 9 but unfortunately, I missed a letter in my e-mail address. When I try after that to register the SW with serial number to get an activate code, the system tells me that the serial number is wrong. Only possible to do once?

The Magix technical support tells me automatically that this software has not been actual for many years and support is not available. I bought the keyboard just a few months ago. Already that old?? Just to throw away now??? How shall I do??