FCP upgrade problem

[infokill]

Im trying to upgrade my fcp3 on my g5 to 4.5 hd, but when it ask for my code and i enter it the "ok" button stays ghosted. am i doing something wrong?
Let it be noted that i am using the upgrade disk from my office to my home ( i know, but im not paying twice for the same prog) so i cant really call apple.
Please someone help me
Thanks

 

[SkiUtah]

try and add a space right after the last letter. that sometimes works.

If that doesn't work, then use http://serials.ws and simply use one of their keys.

 

[ZaniacMedia]

If the upgrade disc is a single user license (which it probably is) and it's already been loaded elsewhere then it probably won't work at all.

 

[shadaco]

Try adding a ZERO @ the end