Cygwin does not include a Go compiler, and therefore the version of fzf you get when you install it, either by running the `install` script or by installing with Cygwin's package managers, you'll be getting the legacy Ruby-based version.

This legacy Ruby code is being retired from fzf, and will no longer be supported. The Ruby version of fzf has been forked and is now being supported as a separate project at [me-and/fzf](/me-and/fzf) (soon to be renamed); future Cygwin releases will be based off that code, and will probably have a different name.