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I have Windows 10 installed on an external ssd. This worked fine until I recently was prompted from some programs, that I need to update my windows version. But the updater did not show any updates.

To fix that I have downloaded the latest update from the microsoft page. Unfortunately during install it says "You cant install windows on a usb flash drive using setup".

Ok apparently I cant install it using set-up, but is there a way to update my windows version to the latest one?

My current version is 1903 and the latest version seems to be 21H2. I would like to keep windows on my ssd and do not have any interest to make room for it on my internal HD.

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Although unsupported, the post Windows To Go (Windows 10) Upgrade to anniversary update offers a solution.

I haven't tested this method so cannot vouch for it, but here it is:

  • Download the Windows ISO
  • Run regedit
  • Navigate to: HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control
  • Change the value PortableOperatingSystem from 1 to 0
  • Reboot
  • Open the ISO in Explorer and run setup.exe.
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  • After some hesitation if tried it, and it worked without any problems.
    – Afterlame
    Commented Dec 11, 2021 at 14:16

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