: This means the installer has been modified to bypass standard activation, often using tools like KMS (Key Management Service) scripts or loaders. Key Features of Version 1803

Installing an older build (like RS4) via official media is possible, but Microsoft will immediately try to update it to the latest supported version (22H2) unless you block updates completely – which is highly insecure.

: Indicates this is the third revision of this specific modified installer by its creator. Installation Guide