serial number for Final Cut express installed on computer
I have a MacBook Pro (17-inch, Mid 2010) on which I had Final Cut Express installed as an option. Because of this, it didn't have a serial number, as it was installed directly onto my Mac. A few months ago, I had to get my Mac repaired (spilled coffee on it, boohoo) but now my FCE is asking for a serial before I can use the product. I tried using my Mac's serial number and that didn't work so it's obviously something else...
MacBook Pro (17-inch Mid 2010), OS X Yosemite (10.10.3)