I recently upgraded a colleague's computer from 8 to 9, and was only asked for the "9" serial number. I'm sure the system detected the existence of 8.
If the system finds an old serial number, it won't ask you for it again. That's why most people only have to enter the upgrade number.
If you install on a fresh system, you enter your Logic 9 serial number. If this is an upgrade number, you will need to enter a serial number for an older full (non-NFR, non-Education) version of Logic! This can be an XSKey with a full license of e.g. Logic Pro 7, but _not_ an upgrade serial number to Logic 8. Older upgrade number become useless if you want to upgrade to the latest version.
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