you'll probably have to manually make a file structure. just look at the way other mods are packaged, and base it off them.
Extract the files content into it and then repack it as .zip, then drag the .zip file to: Documents/BeamNG.Drive/Mods/Repo
no. its a skin of that style. its this https://www.mediafire.com/file/tr6330vii09ff93/super-tron-style.rar
RAR archives are not mods. Only ZIP archives are accepted. Also make sure the mod you found is not too old (ie. before the skin system was added). Making it work will not be the same as other mods in that case.