Cannot install EMDK 5.0 OS Update on TC8000

I downloaded and installed EMDK 5.0 for TC8000 development (which lists as a supported device). However, when running a sample app on the device, I get a class not found exception when calling EMDKManager.getEMDKManager on the device while debugging. I tried installing the EMDK OS Update 5.0 on the device, but it shows an error message "Error: The EMDK update is not supported on this device.". How come I can't install the EMDK OS Update, and why do I get the class not found exception when calling the method above?