None of the mentioned things solved my problem for Yoga 260, the touchscreen was working and suddenly failed as I flipped it back to normal laptop mode. I could see an "Unknown Device" (in Device Manager). When I try to update it via Device Manager, it (expectedly) fails however it comes up with it's name, which was Wacom (something). I installed Driver Easy (not free), it failed to install the Wacom driver for me, however it did mention the version number. I looked for it on the internet and got a similar version number, this fixed my issue. You can find the driver here:
https://us.wacom.com/en/feeldriver/index.php?dlid=93b9f9
Or direct link:
https://us.wacom.com/en/feeldriver/get.php?dlid=93b9f9&file=Wacom_Components_7.7-13.13.24_LEN_win64.exe