Skid Row servers will provide semi-automated installs fior mod cars and tracks.  When you search for the server in Content Manager it will provide an error that a mod is missing.

To install the mod, enter the correct password for the server.  Content Manger will then allow you to click “Install” to install the missing mod. *Note: This method only works for mod content – it will not work for included content and/or DLC such as cars or tracks in  official assetto corsa add-on packs.

Finally click the menu icon at the top right and click “install” on the downloaded mod (as per the repository mod installation in the other guide)