A RimWorld mod updater build on Steamworks.NET
Clone the repo.
Compile both the lib and cli projects.
Make sure you're logged in to the steam client, and not running any steam apps.
Call SteamWorkshopUpdater.exe with the full path to a mod folder as the argument, e.g.;
.\SteamWorkshopUpdater.exe "C:\Program Files (x86)\Steam\steamapps\common\RimWorld\Mods\TestMod"
Most of the code is in the lib project, so you can use that as a reference.
I am absolutely new to asynchronous programming in C#, so my choices may be dubious at best.
Descriptions are currently not handled, as I want to parse the 'html' that Unity uses into the 'bbcode' that Steam uses.