Buongiorno . [Configuration error when trying to install the Audition trial version]

Could you please give us details of the error message you are getting--we'll need that to give any definite answers.

My first guess though is that you need to tell Audition what audio hardware and drivers you will use for recording.  This is under Edit/Preferences/Audio Hardware.  You also need to make sure that the audio settings for sample rate and bit depth on your computer and/or audio interface match the settings you have in Audition.

If it's not that, then more information is needed.