Whenever I try to send something to my ti-84 calculator it always says incompatible type no matter what it is. E.g. I have downloaded Cuberunner onto my calculator before, i deleted it by accident and now when i try to send it says incompatible type. I can't even send my own backup files to my calculator. My calc can still do calc-to-calc file sending/receiving but it can't do calc-to-computer. Maybe i need to reinstall OS by using someone else's calc.
What cable are you using? If its a black cable, you have to have the Ti Graph Link software. You can find it at http://education.ti.com/calculators/downloads/US/Software/Search/Results?cp=7.