You must already own the official Ultimate HD Edition (2014) on Steam to install it.
This is a massive graphical overhaul that replaces almost every texture in the game with high-definition assets. The mod itself is entirely free to download. resident-evil-4-hd-ultra-edition-free-download
Detailed installation guides and the latest files can be found on the RE4 HD Project website. 2. Resident Evil 4: Ultimate HD Edition (Official Game) This is the 2014 PC port released by Capcom. You must already own the official Ultimate HD