can't reinstall Logic 9

Recently transferred everything to my new Macbook via Time Machine fmor my old iMac. I am having trouble finding some random factory libraries, which I still haven't figured out. Trying to reinstall Logic 9, entered in my serial number, but then another screen asks for an "original serial number" - is this asking for my original Logic Express serial number waaaay before my other upgrades???? I have no idea where that box is. Help!