You can use Rufus on another pc to install windows on that external SSD choosing the windows to go option in Rufus. Then you should be able to just plug it into the laptop and boot from it. Or just use Linux and you can install it on an external SSD
You can use Rufus on another pc to install windows on that external SSD choosing the windows to go option in Rufus. Then you should be able to just plug it into the laptop and boot from it. Or just use Linux and you can install it on an external SSD