cryengine 3 download help

what is the diference between cryengine 3 and cryengine 3 sdk ? they are both separate game engines ? or it’s just the same game engine that it’s using two names ? i need help for downloading this game engine but i don’t know wich one of them to use if they are separate game engines, and if so then wich one is better, plz help thanks

As i remember the first is just sandbox for making mods the later where one can program hence sdk (C++). But be warned it wants you to make a account that would be ok but you must be logged in even if only editing in it. Besides the hugeness of the file and as my programming skills may be way off whats needed it is holding me back from using it. And next there is still no importer complete for making assets with blender only static objects at the moment.