2.0 was the first version of Horizions, like 7 years ago. Released on December 15th, 2015 for PC (and June 2016 for consoles). If you're talking about 4.0 (= Horizons, Odyssey version) or Odyssey then yes, that's what Odyssey does.
If you have Odyssey, you can officially choose between base game (whatever version), Horizons 3.8 and Odyssey.
If you don't have Odyssey, you can officially choose between base game, Horizons 3.8 and Horizons 4.0.
Unofficially, you can apparently also select Horizons 4.0 if you do have Odyssey through a command line option.
You don't need to uninstall Odyssey if you want to go material harvesting the old way, you just need to start into Horizons 3.8 from the Launcher.
I tried but I couldn't uninstall it, which is what I do when a game or update is pushing my patience to the limit.
So I'm back with the release 3.8, at least, I know where to go and find my materials, now, there are bugs and triggers in every games, which makes me think that developers have been changing a few things on how the game respond to players.
Best examples: A Cutter will get banged around stations by autodock regularly, not so much an Anaconda, by experience I flew hundred of Pasenger Missions with the Conda), so when it started doing that after I got rid of the shields and added an extra cabin, I knew it was wrong, the ship behavior changed, the absense of shield is the trigger.
In the case of Passenger missions, for as long as they are available from any station, there is no reason to believe that you'll end up in detention after a fine, more to it, that this kind of game behavior is gonna be extended to station from where you have done hundred of missions previously without issues. There change of station is the trigger.
This leads me to conclude that after nerfing mining, developers also have introduced this sort of triggers so as to limit the amount of credit one can make and create ceilings, if they start going after the trade market and son on, we're in for a dire time.
Now, the change of what is available from 3.8 to Odyssey doesn't really encourage me to upgrade but if I still can farm my material in 3.8 once Odyssey is installed it won't bother me, I regularly engineer new ships and more to the point, need to feed my Corvette weaponry, Multi-cannon and Seeker Missile Racks need material for synthesis.
So some players are gonna suggest I use other weapons, no thanks I love my choices, and I don't think that this trend of nerfing stuff in the game makes it better, even if I'm dealing with high end vehicles and such, I'm still working harder than most newbies to get what I want...
