I don't think there is a downloable 'complete' manual. not since 0.8.6.
So many things have been changed, that that manual has become obsolete.

So many things are changing with every version, that it was not possible anymore to inlcude a manual with every version.

You can find all support you want in the 'support' button.
But it is, indeed, a whole lot of pieces, and it's up to you to make the complete puzzle