Version 5.9.1 is notable because it belongs to the generation that introduced updates and improved support for newer DirectX versions, making it highly stable for many older and current titles.
“Fixed depth buffer detection for D3D10/11 games using certain deferred rendering paths. Improved add-on API for depth access.” reshade 5.9 1
Fixed a persistent "No keyboard and mouse input available" message that appeared if the tutorial was not completed. How to Install ReShade 5.9.1 Version 5