On Sunday, 29 Oct 2017 at 08:57, Gian-Maria Daffré wrote:

[...]

> This helped a lot...

Glad I could help.  However, your original problem still remains.  You
should be able to export using the latest version of org
(i.e. 9.1.2).  It would seem that your configuration is making reference
to the default version of org *before* you ask for the new version.

I find that you need to have your package-initialize as the first thing
in your .emacs to ensure that the new version of org takes
precedence.  Have you tried doing this with v9.1.2 installed?

-- 
: Eric S Fraga via Emacs 27.0.50, Org release_9.1.2-117-g5b2b8f