Wicktum said:
It's a mystery~
Personally I suspect it's pretty much dead, but I could be wrong. Would be nice to know if it's still hanging in there or if it died a silent death.
Well, at the SimYukkuri download page (https://osdn.jp/projects/simyukkuri/releases/) there is a new test release dated 2015-09-11 (1.14).