Two avenues to try.
Craig cameras wrote me a while back and said
all the CD's that I have, both for repair manuals and instruction manuals will be donated to the Toronto Photohistorical Society, put up on their website as the John S. Craig Collection and will be free to the public to download.
It may be they dont have one for the Z800..
you may have to register or join to gain access to their manual collections (I havent looked)
and try
https://www.ebay.com/str/goodygifts
e-mail as they just may have it ?
Good luck