Upgrading the X98pro was a peace of cake
first download Windows10 anniversary edition here from Microsoft
https://www.microsoft.com/en-us/software-download/windows10ISO/
Extract the contents of the downloaded ISO file to a USB stick
Connect the USB stick with a OTG cable to the tablet, In Windows the tablet will recognize the USB stick
Browse to setup.exe and run it, follow the instructions and after about one hour your tablet is running the newest Windows 10, no additional drivers are needed