If you install windows media creation tool or have a win10.iso handy to make a normal practice usb boot disk. Go throught the windows installation to the bit where you have to select partitions and any partitions that say unallocated space select and make new partition(s) then install windows to the 16gb partition. When windows has fully installed you can now install the Official WINPE boot disk.
This problem bothered me for a month or so, but finally fixed.
Just copy this file WIMPART_DUAL.txt into the USB “images” , DON’T RENAME THIS FILE, and put it inside the folder “images” then following the Teclast offical flash pdf procedure then windows installation will be fixed