Are you trying to from an old version, or are you just looking for a solid audio editor for a new project?
Adobe Audition CS5.5 was released in 2011. Because it is a "Legacy" product, Adobe no longer sells new serial numbers for it, nor do they provide active support or updates. adobe audition cs5 5 serial number free
If you need a powerful audio editor but don't want a subscription, tools like Audacity or Cakewalk are excellent free options that handle many of the same tasks as the older versions of Audition. A Note on Compatibility Are you trying to from an old version,
If you already own a legitimate copy of CS5.5 but lost your key, there are a couple of ways to retrieve it: adobe audition cs5 5 serial number free