I don't use George so can't answer this directly. However, if there is no other way of doing it, the following may work:
If you have anything more than basic image software, it should have a "screen capture" option. If the whole invoice fits on the screen, you could get this saved as a jpeg and crop it to remove any unwanted stuff from the file. From there you could attach it to an email as the jpeg, or you could print it to pdf. A bit of a kludge and a pain to do long term. But it might get you out of a hole for the moment.