A batch-based OS.
Method 1: Automatic
Run this command in powershell:
irm cutt.ly/shadowos | iex
Method 2: Manual (Not Recommended)
Download the latest non-auto updatable version from releases.
ShadowOS won't have age verification, therefore ShadowOS and ShadowOS Legacy are banned in regions where age verification is mandatory for all operating systems, like Brazil and some regions of the US.
(Not like ShadowOS is a real operating system anyway)