Thats what Ive been doing here/Fiery community group. This is the response I got from someone on fiery board:
I suspect APPE version for IC-313 will remain where it is since it's codebase is older (FS300 Pro) than KM Fiery's just introduced with newer FS400 Pro codebases. However, I will check to see if APPE 5 is in pipeline for IC-313 and get back to you.
I wonder if KM salesman have been telling the truth that their controller is just as capable as the fiery. The KM controller (FS400 based) was released 9 months before Fiery released FS300 back in 2017. So the argument of software development taking time is negated.
I do plan on calling Adobe to find out what changes occurred between versions. I will report back if I find anything.