Here's the version 1.4 of the YafaRay rendering plug-in.
It includes the last version 3.5.1 of libYafaray with the small improvements that I previously programmed for YafaRay plug-in (better handling of images and memory errors). The plug-in is smaller this time (15.8 MB instead of 21 MB) because it doesn't need Boost and some other libraries anymore.

Under Windows, the plug-in should now work correctly if your login contains non ASCII letters (i.e. accentuated or non Latin letters).
Under macOS, I signed the [font=courier new].dylib[/font] files in the hope it will fix some security issues. Not sure it will be enough for all cases, though...