Would you like a technical explanation of what such a tool might actually do (e.g., interacting with Steam Workshop or custom mod platforms), or another story variant?
Because you are not using the Steam client, the files will not install themselves. You must manually move the downloaded file into the correct game folder (e.g., the addons folder). scmd workshop downloader
Getting started with SCMD Workshop Downloader is straightforward: Would you like a technical explanation of what