Just over a month ago, a modder (called TheWorse) located and reactivated a bunch of graphics settings that had been hidden inside the PC version of the Watch Dogs code. That resulted in said modder releasing a “mod” (really just a minor file tweak) so that all PC gamers could experience Watch Dogs the way it looked when it was first unveiled in 2012. This caused a bit of a scene and Ubisoft had to release an official statement. The graphics tweak stopped working shortly afterwards thanks to a Watch Dogs update. Good news then: TheWorse is back with a final build of the mod. It comes in two flavours: one with a built-in high-res texture pack (the work of a separate modder) and one without the texture pack. Grab the texture pack bundled option here (about 770MB) and the straight graphics mod option (about 125MB) here.
Source: TheWorse Blog