Hello, after changing my login email, I can no longer find my software.
If you've changed your email address on your MAGIX My Account, the next time that you open any of your MAGIX products (e.g. Vegas Pro, Sound Forge Pro) the activation/registration window should appear where you'll need to change the old email address to your new email address on the email address field on that window. After changing my email address on my MAGIX My Account last month, I've needed to do this a few times.
If this is not the issue, please better explain what you mean by "I can no longer find my software". Where? - On your computer? On your MAGIX My Account? Or something else?