I have the D2D version. It's hard to make a mistake about which version I'm supposed to download. I've performed several tests and can't seem to get the trainer to work after installing Return to Osagar (or however you spell it). It did work previously, but it has been a couple months since I've played at all, so it could be a patch or the Ostragar addon.
I've walked through the debugging steps for each pass and have even tried downloading the retail version instead. The retail version says all the right things, like "Trainer Enabled", "off", "on", etc., but does nothing. The Steam/D2D version does the same, except that it crashes the game about 40% of the time after trying to apply gold or whatever. I found another site that enables a gold cheat (www.gamespot.com/pc/rpg/dragonage/hints.html), so I'm not crippled, but it would be nice to get an updated trainer that works.