http://winsupersite.com/windows-10/how-install-windows-10-build-10565-small-form-factor-devices
My upgrade failed three times (with a freeze late in the Install portion) until I tried this. It's strange, but it works. And obviously you can switch back to Landscape mode (and rotation lock) when the upgrade is complete.
My upgrade failed three times (with a freeze late in the Install portion) until I tried this. It's strange, but it works. And obviously you can switch back to Landscape mode (and rotation lock) when the upgrade is complete.