just got a new computer. i had music studio 10 on it that i previously purchased from Sony online. now i can't find my installation cd for it in order to install it on my new pc. i downloaded the registered version from the Magix website, but i can't find it. i am still trying to in that cd, but will i need to buy another one, and do i need it to install what i downloaded? i have the manual with the original serial#. thanks.