Are they 32-bit or 64-bit? 32-bit ones won't work unless you use bridging software like jbridge.
Try right-clicking on one of the files and go to Properties - that might tell you directly.
It looks like they are 64-bit.
In that case try it again and give it longer. If it still freezes, then you need to stop Audition and post the last log file contents into this thread - it should indicate where and why the process is failing, although there are no guarantees that it will...