Do you mean files from: Downloads Home/Wireless/Wireless LAN Controller/Mobility Express/Mobility Express for Aironet 1830/Cisco Mobility Express - 188.8.131.52 ?
If so and If you have CAPWAP AP already with AirOS 8.8.100 and want to change type to Mobility Express you need to download AIR-AP1830-K9-8-8-100-0.tar from Cisco.com to tftp server. To change the ap type you have to use CLI command "ap-type mobility-express
If you have AP working as a Mobility Express controller with earlier version (example 8.6.x and you want to upgrade to 8.8.100 you have to use AIR-AP1830-K9-ME-8-8-100-0.zip. You can do it via GUI using HTTP, TFTP, or Cisco.com using your Cisco credentials.
To do all above you have to have valid support contract.
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