For volume licenses, use the Adobe LWS portal to retrieve keys.
: If you previously purchased and registered Audition CS5.5, you can still find your legitimate serial number by signing in to your Adobe account and checking your registered products. adobe audition cs5 5 serial number free
If you want, I can instead:
If you need Adobe Audition CS5.5 legally, options: For volume licenses, use the Adobe LWS portal
If you are looking for a way to get the software up and running, here is the lowdown on the current state of Audition CS5.5 and how to handle licensing. The Reality of CS5.5 Serial Numbers For volume licenses
: Websites or forums providing lists of 24-digit serial numbers often include keys that are blacklisted, revoked, or tied to malware-infected "cracks". Legacy Activation Issues