One thing that just tripped me up - The executable on Windows has to be compiled for the same processor platform as your NW.js. (Or, at least in my case, the 64-bit updater couldn't rename the folder for a 32-bit app.) Otherwise you'll get an "access denied" error.

Plugins need modification to work. A good plugin that is being used in this engine needs:

1. Any global variables assigned to the window object
2. All modifications to classes defined in declaration merges, either in file or in an independent d.ts file
3. All modifications to game objects that remain in state on saves and loads (that is, that uses JsonEx) using the replacement process for sav