In modern versions of Windows, RSAT is often built-in as an "on-demand" feature rather than a separate manual download from the Microsoft site .
Remote Server Administration Tools for Windows 10 - Microsoft
Remote Server Administration Tools () for Windows Server 2016 allow administrators to manage server roles and features from a remote computer without needing to log directly into the server via Remote Desktop. Depending on whether you are using a Windows client (like Windows 10) or another server, the "download" and installation process varies significantly. How to "Download" and Install RSAT
If you are using a modern Windows 10 workstation to manage your 2016 servers, do not download a standalone package.