the manual lists all the additional engine and plugin files that must be included with in a redistribution , BUT make sure you read it correct so you do not break laws , if you want to manually copy , because they are supposed to be copied with the engine automatically ,but since the last version some mistakes was made which now causes this .

it is best to talk to jcl , about any other files that aren't copied over during publications .

this particular one I believe I have already mentioned to him in bug hunt.