You will find your Setups folder in your Documents under Assetto Corsa Competizione. Just download the Folder you need or well the whole Setups folder. Fell free to use them and well it would be really great, if some of you would do the same and post the Setups they use :). The following link contains my whole Setup folder and all the Setups I build or collected over the time. Racedepartment has a page for Setups, but well its not really used. I have searched a lot on the internet, but except for some awesome guys out there that upload there Setups to Youtube (big shoutout to u/KrypticTMG and theschmid) I find it pretty hard to find Setups at all. So I would be really interested in your Setups and how you like your cars and well some might even find their new favorite Setup that someone else build. Yes you can use the standard save and aggressive Setups, but self build Setups are sometimes just a bit better and find the right balance between stable and fast.
I often struggle when testing new cars and well as everyone knows it takes quite a while to build a good and stable Setup.