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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.

Afterlame
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    [The deletion of the key responsible for the hard block on actual Windows to Go install likely will result in the installation ceasing to be bootable.](https://superuser.com/questions/1307539/windows-10-update-1709-fails-on-m-2-ssd/1307555#1307555). You have been warned. Windows to Go installs cannot be updated. You will have to reinstall windows using an updated ISO. What you want is not possible – Ramhound Nov 27 '21 at 17:03

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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.
harrymc
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