If you've lost your key, Apple no longer provides official recovery services for iWork '06 as the product is "obsolete." Most users have transitioned to the modern, free versions of Pages, Numbers, and Keynote available on the Mac App Store Are you trying to recover a lost key for a specific project, or are you having trouble installing the software on a newer Mac? iWork 06 serial number(s) - Apple Communities
Mac OS X 10.3.9 (Panther), 10.4.3 (Tiger), or 10.5 (Leopard). It will not run natively on modern macOS versions. iwork 06 serial number