Many thanks for all the replies & offers of help, in return I have attached a copy of ZU with an English readme / instructions.
It is not clear to me what the release versions of ZU are, but am guessing that it's the release date in the filename.
If so, this is the 2013 version.

Maybe it can be added to the files section?

For some reason my other web browser, Firefox, is now complaining about the files section of this website. I think it's a google thing...