Thx Roni, now everything is working. One last question: After the install of win10 I got a 12 GB folder which is called Windows.old (obviously the win 8.1). Can I just delete it or is there a clean way to get rid of it?
I was able to upgrade to win10 with Roinis method. Win10 is activated and updates worked out fine. Everything is working except for the touch panel. I’ve done the double driver restore and also copied the driver in the system32 folder with a restart. But in the calibration it is still not working. On almost every tip there appearing two points on the screen. Any thoughts?