I've been trying for days to use this exploit on my TI Nspire (not cx) running 3.9.0.43 and when I drag over the nlaunch.tno file to the calculator and confirm that I want to install it one of the following happens. It says "please delete 4kb worth of files to proceed" and the install screen on the computer closes, or it says "calculator is busy" or their is no error and on my computer the loading bar in the installation window stays at about half. I've left it over night on each of these and each time the "operation system not found. Install OS now" prompt on my TI Nspire doesnt go away, and the loading bar doesnt move. Does anyone know what my problem is? Also can anyone post a picture/video of what a proper installation/error message looks like.