With the Chat option i could find a great person at Nakivo and i succeeded in setting everything up.
The Qnap Nakivo Transporter version that my NAS was offering to update (v9.4.0 July 2020) turned out it was OUT OF DATE !!!
So i updated the Linux VM of Nakivo Backup & Replication to the latest version 10.
Careful that Nakivo Transporter V9.x can't work with Nakivo Backup & Replication version 10.
Then with the great help of the chat guy at Nakivo i could find at Nakivo website ( https://www.nakivo.com/resources/download/update/ ) the right QNAP Transporter app V10.
It was a bit tricky cause i had to clear the cache of my browser to see it ...
I downloaded, then manually installed on QNAP (without stopping or uninstalling the v9.4.0) and WORKED LIKE A CHARM.
SO ... Ditch all the other way to contact Nakivo ... Just chat with them. You will succeed.
Now i'm happy.
Also posted 2 hours ago: