The Steam Workshop costs you nothing, since it is a completely free service to utilize.

The game does not support the Steam Workshop since there is no Browse the Workshop option. While inside the workshop, you can use the search option or one of the sort icons on the right to peruse the large selection of user-uploaded content. If you wish to download anything such as a mod or a map from the workshop, make sure you sign in with the Steam account if you’re using an internet browser. You may also access it directly from the Steam client by going to the ‘Workshop’ section underneath the ‘Community’ page. You can go to the Steam Workshop Page by clicking on this link, or alternatively, you can search it up on Google. Mods, graphics, textures, maps, and so much more are all available through the Steam Workshop. It’s a community-driven platform where people and content providers may share as well as download game-related materials. The Steam Workshop is a component of the Steam gaming client.

Downloading steam workshop gmod