This can mean one of two things. Either Logic Pro is not in the applications folder, where it needs to be so the updater can find it, or you have changed it's name, in which case the updater won't be able to find it either.Did you have any problem upgrading logic to vers. 9.0.2?
I downloaded it but when I tried to upgrade I got a box saying "Your computer does not need this update." and I'm at LP 9.0.0