If you're looking for a lightweight version of Windows or a specific edition:
Yes, as long as you own a valid Windows license. The ISO is a transformed version of Microsoft’s code, distributed under fair use for customization purposes.
While a lightweight OS sounds ideal, running a modified third-party operating system comes with substantial risks. You must carefully weigh these factors before deciding to download and install it: No Official Microsoft Support:
It’s a modified, third-party version created by individuals to reduce system requirements, remove bloatware, and improve performance.