Convert the Shotcut MLT files into a Blender friendly CMX 3600 EDL format by using a python script (exe build for Windows). Which means that you can do your editing in the free, cross platform, video editor Shotcut and import that project into Blender for working on the post effects.
So errors where reported in the exe build, so I’ve tried to build with pyinstaller istead of cx_freeze. I hope this one works better. So try to redownload it.