Can I trust that Steam won't install any software such as DRM, DirectX or other libraries before I actually run the game?
The reason I ask is that I'd like to download a sizeable portion of my library. Since that's approaching the terabyte range and could take a week or more I'd like to download all the necessary files to my (always-on) home server and then move them to my desktop. But that server is a clean install of Windows Server 2012 and I really don't want to pollute it with all manner of DRM and other shenanigans.
It used to be that Steam wouldn't run installers until the first run of the program and it certainly seems like Steam still has to configure something after I download a game, but can I fully trust that it won't install anything as part of the download process? All I've found on the subject was a steam forum post from 2015 which is a less-than-authoritative source.
Note: I have checked related questions but none seem to cover this exact scenario. I've only found related questions about moving downloaded games, installing DRM-free games without Steam or the security of the Steam application itself.