Available on GitHub (nipkownix) or as part of the Resident Evil 4 HD Project.
If you’re trying to play the original Resident Evil 4 PC release (2007) with full mouse support, you’ve likely noticed that the default version only supports keyboard or controller. Fortunately, fan-made patches and mods add proper mouse aiming and camera control. Download Resident Evil 4 Pc Mouse Support
"The game crashes on launch."