NOTE: You must own the original game >observer_ in Steam
Just happened to stumble across this. Promotion has been running since August 27th, luckily still has a couple of days to run.
About This Game:
Observer: System Redux is the definitive vision of the award-winning cyberpunk thriller, rebuilt and augmented for the next generation.
Veteran Observers can dive deeper into this dystopian reality thanks to three brand-new side cases to solve. “Errant Signal”, “Her Fearful Symmetry” and “It Runs in the Family” add another layer of depth to the game’s story while exploring thought-provoking themes of a future that soon might become our present.
On top of that, System Redux offers expanded gameplay, which includes new game mechanics, new secrets to find, redesigned stealth, additional neural interrogations, and quality-of-life improvements made with the help of the Observer community.