Navigate to: D:\sources\sxs\

/online : Tells the tool to make changes to the operating system currently running.

: Use the official Microsoft Media Creation Tool to download the ISO for your version of Windows.

Microsoft does not provide a direct standalone download link for this specific file. It is part of the Windows Installation Media Server Fault Download the Windows ISO : Use the official Microsoft Software Download

If you don’t have access to an ISO, use UUP Dump (a legitimate community tool that generates download scripts for Microsoft-sourced files).