http://www.pcgamer.com/fans-remake-the-witchers-prologue-in-the-witcher-3s-engine/

The first Witcher was a great game, but I returned to it recently and it's showing its age. If you want to learn more about Geralt's origins but can't take the rough edges then you're in luck, because you can now play through its prologue in The Witcher 3's engine thanks to a fan-made mod.

Witcher 1 Prologue Remastered does exactly what it says on the tin, recreating the opening hour of Geralt's first outing with all the visual and mechanical excellence we've come to expect from CD Projekt Red. It's not perfect (it's basically a complete recreation in the Witcher 3, and some things don't translate directly), but it looks pretty darn good.