I bought both Don't Starve and the Reign of Giants DLC. The base game works fine. When I start the Reign of Giants download "start.sh" it asks for a path to install. Where does it have to be installed into? In the main directory of Don't Starve? Or in some subdirectory of it?

When I install it into the main installation directory of Dopn't Starve, the main game vanished - it's not in the Mods section, but the whole game calls itself now "Reign of Giants" .... is this intended? So is this not a mod but an upgrade of the game?