Product activation is required to use this product.” See Error: “Activation Server Unavailable” | CS2, Acrobat 7, Adobe Audition 3. “Activation was unsuccessful because the activation server is unavailable at this time.” See Activation or connection error | CS3, Acrobat 8. See “Activation limit reached” or “Sign-in failed” error. This serial number has already been activated on 2 computers.”