Which version of Audition are you trying to download and from where?
This happened to me as well. I tried downloading both the CS6 and the CC and it popped up both times. How do I resolve this?
You really need to contact Adobe support about downloading and installation problems. As a User to User group we are more able to help with questions related to the operation of Audition.
Welcome to Adobe forums.
Please use the below link to download Audition CC.
Please make sure to complete the very important instructions prior to clicking on the link.