Can't get past serial entry screen while installing FCP 5
I am trying to install final cut pro 5 on my iMac G5 running Tiger 10.4.2.
I can get so far as the screen which asks for the serial number and upon entering this number I cannot get any further. (The continue button will not highlight.)
I have tried all different combinations of uppercase and lowercase text and leaving out the organization field to no avail.
I have spoke to apple and they have confirmed that i have the correct serial before trying to put me through to someone else then leaving me on hold for 30 mins.
Please could someone help me out on this issue.
Thanks.
Leon