Find the install.wim file inside your mounted ISO ( sources\install.wim ). Then run:
If Rufus doesn’t work, use the command line on a working Windows PC. how to install windows on an external hard drive
. Rufus will ask which Windows edition you want (Home, Pro, etc.) and may offer to disable certain requirements like TPM or let you create a local account automatically. Microsoft Community Hub +3 3. Boot from the External Drive Once Rufus finishes (this can take 20–40 minutes), you need to tell your computer to start from the external drive instead of the internal one. Microsoft Community Hub +1 Restart your PC and immediately press your BIOS/Boot Menu key (usually Find the install
You need a secondary computer to prepare the external drive. how to install windows on an external hard drive