Ive installed it before but got a new computer and tried downloading it again but am notable to since it says i dont have the right email for it available
If you registered the program with a different email address, you can log in to your account at magix.com the Account login is top right of the home page and change your email address to the one you wish to use and then download, install and register.
If you have forgotten your password then email infoservice@magix.net and ask them to change it for you - you will need to give them more information such as order number and serial number.