Like what kind of trouble? Mine downloaded like a normal plain old file. Also isn't the sentry supposed to automatically attack enemies? If so mine won't attack automatically I can only attack manually, like a unmanned turret.
Have you waied for it to go beep first?
When you hear a beep, you know it is ready for use.
And enemies are not zombies.
Zombies are currently not supported.
*hopes they will get supported though*
