The manual is a part of every OpenCPN installation
Find the blue button with a "?" on, in the Toolbar, normally at the top of the screen
. Then go to the "Help" tab.
The manual will now open in your browser.
So there is never any need to download the documentation
, unless you are beta testing, and want a local copy of the latest version.
All kind of versions of the documentations are available on the Download OpenCPN | Official OpenCPN Homepage
The "Live Snapshot" will be a copy of the present wiki, including all available updates.