The 1.61 series of Snes9x introduced several major improvements that are refined in these development builds:

Because Snes9x is a "portable" application, you don't need a formal installer. Snes9x v1.61 - EmuCR

: This era saw the introduction of Vulkan support for Windows, providing a high-performance alternative to OpenGL.

EmuCR Snes9x 1.61: The Ultimate "Git" Build for SNES Enthusiasts

: This is the base version (1.61) plus 1,085 additional "commits" or updates since that version was tagged.