Dear dsayers, once more I've to understand that there is always a reason ;).
Looking backward at what I've done makes me feel a little bit stupid: I've used an IPK not suitable to my image (python 2.x) without realize that the lack of the dependency has to sound to me as an alarm.
However, just to laugh, I discovered that anyway the plugins works, in a strange manner, but works :loolz::loolz::loolz:.
It shows the variuos servers NordVPN if I put the files in the folder /mnt/usb/openvpn, but only under the condition to create an ulterior subfolder under /mnt/usb/openvpn and saving the path to this subfolder inside the config menu of the plugin... absurd but so it works! I can choose start/stop the various servers, but it doesn't compare any info regarding the connection in the upper-right window of the plugin.
I would try to use the plugin in OpenATV 8 (so with python 3.0), but I've already discovered that installing this image on Vu+ Duo2, this one crashes imediatly after its installation and configuration of the main parametrs in image, as soon as I choose to download the list of the plugins (green button) :crying: .
Anyway, now I will disinstall VPN manager 1.1.6.ipk to subsequently revert to VPN manager 1.1.4.ipk (I think it's the last for python 2.x).
Have you something different to suggest to me?!?
Thanks a lot and many regards