Yeah, you can download it there and install even upon your existing free version and get it to work (free) for eight working hours after which it will decently downgrade into the free version unless you pay purchase a license. Basically only the 3d and 2d vector format export is an added funtion in the pro version currently - plus there is a presentational software called "LayOut" and lately "StyleBuilder" that are added to the pro version. So only download and install it when you feel the need to try these functions out. If you are still at a stage of exploring the modeling functions of SU keep it for later...