Hi, hade the same Problem. No Update possible because the Intel graphics accelertor is not compatible. Then I created a usb stick with the help of media creator and tried to install Windows 10 on my Asus TF810c. The Installation took a while (longer than on my desktop pc). But it worked and finally I had Windows 10 running on my VivoTab.
Everything seems to work, but in the evening I saw, that the Display was very bright shining, so I tried to dimm it. No Chance. I noticed as well that the TF810c was as Little hot and saw, that the Display doesn't get off when I put the device ins sleep or Close the cover.
So I searched the web an found a page where they suggest to delete the graphics Driver. But in my configuration the Intel driver was already uninstalled. So it didn't work for me. My search went on...
Then I found this page:
www(dot)driverscape.com/manufacturers/asus/laptops-desktops/tf810c/15581
and I thought, I should try before I go back to Win 8.1. I downloaded the graphic Driver, installed it and thatha it worked like a charme.
I can't say much to the other functionality. But till yet I didn't found any other issues. So feel free to try. BUT create a recovery stick of your Win 8/Win8.1 System before you begin installing Windows 10.
have fun
Greez
R?tsch