It's been awhile. I vaguely remember installing W10 1809 64bit is not a problem. Drivers might have been fetched from the Internet during the installation process, but I do not remember. https://www.udoo.org/forum/threads/any-success-using-32gb-emmc.27219/#post-52662
I just installed and have been working through 1903.. I had to disable TPM (security) in the setup and eMMC in windows device manager. I downloaded the latest drivers from amd for the vega embedded chipset.