My understanding is that Larian made quite a few changes to the dialog and several quest changes. Pretty much this is a "New" game (and I will say the use of the latest Direct Video system works a treat on my computer)
Can't go back and load the present EE players in the orginal Original Sin game and vice-versa.
By previous version, I didn't mean the other game (the non EE edition), I really meant the version before the patch on December 10th. All the problems with lag have been introduced by a patch to the Enhanced Edition, so removing that problematic patch would solve that, thus my inquiry.
I fully understand how those things work, that's what I do for a living, albeit not for games, but pretty much the same thing when it comes down to it. When we can't give the right fix right away, we try to give one that will hold until the final fix is in. All that because we know the customers need our software to actually work, you can't really afford downtime. It might not look like it, but it's even more true for games. For example, Bioware's Dragon Age Inquisition multiplayer lost 90% of their player base when they introduced their "Destruction" patch just before Christmas last year (yes that was the real name, ironically it destroyed their game...). Had they simply rolled back their patch as soon as they detected the problems, the game wouldn't be "dead" today (ME3 MP has a bigger playerbase now and it's over 5 years old). The point is, it doesn't matter how much time they took to fix the problems (4 bloody months!!!), what killed the game was the fact they didn't release any "hotfix" (disabling the problematic DLC) to alleviate immediately their users problems.
Furthermore, they made a rookie mistake by releasing a patch a Thursday, 1 week before Christmas. You never do that, never, for ANY software. That's like begging for things to explode. Patches are always from Monday at noon to Wednesday 2PM, otherwise be prepared to work on weekends or holidays. That's the bloody law of software development.
In any case, Larian seems to be pretty good at communicating and helping their users. All the interactions I had about this problem have been top notch. I merely suggested there was another way to "hotfix" the problem by allowing us to revert to the pre December 10th version. I understand it could only work for PC users, sorry console users, but I'm on PC so that's what's important to me. Color me partial

Also, I took 2 days off work (from accumulated time) to play the game for 2 weeks straight. First time I sit to my computer thinking I'm gonna have a blast, the game is broken... Of course I'm gonna be a tiny bit pissed about it, look for solutions and put a bit of pressure