I have registered the Movie Edit Pro to the different email address. Now I have new laptop and new email and it is not possible to use the software until I have registered it. It seems impossible because the old email address is no more valid.
Assuming your previous email address was registered with Magix you should be able to log into your account using it and then be able to amend your details to show your new email address.
If, for some reason, you cannot do this you will need to use this page to contact Magix Customer Service, explaining the situation and giving both your old and new email addresses, asking that they amend your account details.