Ok let's try this, restart your computer and boot into safe mode. Try running the addon in Safe mode. If it works in Safe mode we can safely assume that something is blocking it from running. If it doesn't run then I really don't now what els to do..
In windows explorer hit the windows key + R, that will open search, then type in " %appdata% " and hit enter. at the top should be a folder named .jffaddon and then inside that should be a logs folder.