As far as I know, the 4th edition (with accumulative amendment 3 dated June 1962 plus supplemental amendment 5 dated June 1964) is the last version that the factory ever issued. None of the drawings were ever updated, even when the later parts are listed (as is the case with the hood lift).
I do occasionally update my copy with more info (eg I added a plate with the generator mounting and some notes here and there), but not very often. There are way too many other interesting documents that I don't have scanned at all.