I tried my first vehicle download Thursday with window's 8. It stopped downloading at the validation. I gave it a couple extra minutes, and it didn't go any further.
To make it worst, I couldn't close the download box or the window. I unplugged my computer from the interface and still couldn't close the download box. I closed the top of the laptop, and I pulled out my laptop with windows7 and had no problem downloading the tuning the rest of the vehicles.
The next day, I opened the top of my windows8 laptop, and the unable to load the calibration was still up, and I still couldn't close the box. I couldn't do a print screen to save it. I had to do a hard reboot and reset the computer.