Red Dead Redemption has not been released on PC officially, but it can still be played on PC thanks to the Xbox 360 and PlayStation 3 emulators. Visuals' quality isn't the best, but this is going to change soon thanks to an unofficial remaster project that has been revealed recently.
The RDR Damned Enhancement Project aims to improve the graphics' quality considerably with improved textures, optimization and more
Red Dead Redemption: Damned Enhancement Project is a direct modification of a Xenia/RPCS3 (X360) (PS3) versions of the game, running on x64 Windows PC platforms with redefined graphical elements in high quality, including but not limited to;
textures, UI/UX menu elements, in-game HUD, draw optimizations, shader and model updates, Alpha/Beta Stuff and many more.
The target of the project is set out to remaster and optimize Red Dead Redemption to run and look better, from within the Xenia/RPCS3 emulators (https://xenia.jp/) (https://rpcs3.net/) on x64 Windows PC platforms and console level hardware, software compatibility support (e.g. Sony PlayStation 3, Xbox 360).
A new trailer has also been released, and you can check it out below.
Things are already looking good, and it's been confirmed that the build showcased in the trailer is an older build and many improvements have already been made.
Red Dead Redemption is available on PlayStation 3 and Xbox 360. The game's sequel has been released on PS4 and Xbox One last year.