Somebody on another forum found a trick for running HBO GO, whoich had a silmilar problem; don't know if this same solution will work -
When you first launch it, it identifies the device as not being compatible, and stops running. What you do instead is disconnect your wifi connection before you launch the app, so that it can't check for compatibility. Then, once you're past the welcome screen, turn the wifi back on.
This works like a charm for HBO GO on the Fire; I don't know anything about this other app. You mean it runs Hulu+ for free, right (not regular Hulu)?