Win10 on usb installed but setup not starting/continuing

He should making an UEFI compatible hard disk for an UEFI system or he should enable CSM (Legacy BIOS) mode for a Legacy installation to work. If he tries to boot the wrong type of disk it will never boot properly.

mike s said:

Wow. Coming back to this thread after a few days, I can't understand why this discussion has strayed so far from the OP's original question.

He is creating a WindowsToGo using the current build of WinToUSB - a recognized utility which has a proven track record of creating functioning ToGo installations. So post #8 (you can't fool Windows) is totally off base as he is already well past that limitation. He is using a utility whose specific function here is, yes, to fool Windows. (Most of these utilities seem to automate what you could do manually; i.e. use imagex or DISM to unpack install.wim onto a formatted and "active" partition on the USB device).

When creating ToGo manually or using third-party utilities, you are free to choose any ISO compatible with your machine's hardware and architecture (post#9). The "gotcha" comes when the activation routines come into play, but licensing issues will not prevent you from successfully completing the boot process, which is the OP's problem.

Thanks for clarifying that, @mike s.
However, the language choice could also be the culprit.

Nevertheless, I ditched the setup on the external drive and will install on a new/second internal drive.
Thanks all for trying to help.