Clean install (format) increased my Windows C drive from 13GB to 19GB.
Downloaded from Windows 10Ā download page, then IĀ installed (with USB keyboard and mouse because touch didnāt work):
Chuwi Hi8 Touch installerĀ to calibrate touch (needs reboot).
Insyder app for dual boot button.
@roni-aluch where you find the Insyder application?