First, make sure you've got the Developer's Edition installed. It's the only version out for new purchase now on Steam/GOG, as it's Larian's "final" version of the game (and it rules, by the way). If you owned Divinity 2 it should have just been placed into your Steam games library to begin with. You will need to uninstall Divinity II or whatever earlier version you have, as it's just a waste of space now.
Dragon Knight Saga was an expansion pack that ended up getting rolled into the Developer's Cut for a basically "YOU WANT IT ALL? HAVE IT ALL!!!" uber-game release.
CH -very- understandably stopped developing trainers for this game when the Developer's Cut hit, specifically because the devs themselves basically put a built in trainer/editor into the game. Here's the FIRST quote off the Steam page for it, boasting about all the wacky stuff you can do (page here: store.steampowered.com/app/219780/ )
Developer Mode: Play the original version, or experience the game like the designers did and fool around with console commands to your heart's content! Ever wanted to test some new skills on a hoard of a hundred goblins? Go for it! Ever wondered what it would be like to explore the game-world in the guise of a troll? Well there you go! Discover a whole range of spectacular developer commands and feel like a wizard at play!"
Just make sure you've got the game called "Divinity II: Developer's Cut" and make sure that you're in "Developer Mode" when you start the game. It gives you two options - Normal Mode or Developer Mode. The latter lets you cheat to your heart's content throughout the whole game (Divinity II, remastered, plus Dragon Knight Saga, plus some extras just for Developer's Edition!), while the Normal Mode is (as you'd imagine) the same thin, all the Dragon Knight & Developer's Edition content - just no cheating.
It's possible that Developer Mode disables achievements, but who cares about that haha just go have fun with your vidyagame, frak the 'cheeves. They're mainly intended for publishers to know how far and how deeply players go into a given game, to make decisions about future games funding. That little progress bar you see on Steam is worth a whole lot of money to the publishers trying to make decisions as to where to put their investment capital when studios come in with a good idea and a prayer.
Hope that helps.
[Edited by Agreed, 8/27/2014 1:09:57 PM]