Can't beat the price of free. No parts of the game are missing, just for all of you patient folks.
Quick note: It is a remaster of the original game with the base game and the DLC expansions that were released for it, visual updates and a higher level cap and possible other tweaks. Some reports of stuttering and poor performance.
It feels like a sequel honestly. Kind of incredible how many of the core mechanics from the base game they threw out in service of telling a new story differently.