Hello,
You can only run lightweight or Mobility express with 1832 model, not autonomous.
If you want to use mobility express, you can check this link :
https://software.cisco.com/download/release.html?mdfid=286288035&flowid=76322&softwareid=286289839&release=8.3.112.0&relind=AVAILABLE&rellifecycle=&reltype=latest
Alex-