When you install Flash Builder 4.6 and enter your Adobe Creative Suite 5.5 serial number, you see the following message on the Enter Serial Number screen:
“This serial number is not valid for this product.”
If the CS5.5 software on your computer is already serialized, Flash Builder launches without prompting you to enter a serial number.
If the CS5.5 software is not serialized on your computer, Flash Builder prompts you to enter a serial number. Enter your Adobe Creative Suite 5.5 serial number in the Serial Number panel. Once Flash Builder is serialized, the Serial Number panel no longer displays on launch.