Hi,
CUBE licenses are paper licenses, you dont install it on the device itself. They are called RTU (Right to use).
See below for help.
https://supportforums.cisco.com/discussion/11035831/cube-licensing-29xx39xx-routers
http://www.cisco.com/c/en/us/td/docs/ios-xml/ios/voice/cube/configuration/cube-book/voi-cube-licensing.html
JB