first of all, my thanks for all your support. I have notice that in my plex 0.92.1 rlease home page , it suggest to download and upgrade a version of 0.9.12.3
what do you think about it? I dont want to crash my dns, so I ask to the masters...

Install the suggestion from plex web server on my dns 320lw?
suggested link is https://plex.tv/downloads/latest/1?channel=16&build=linux-qnap-arm&distro=qnap&X-Plex-Token=rp5K5Bcn9Fu8PRz1s9yc
upgrade only from vertv version launched? from http://dlink2.vtverdohleb.org.ua/Add-On/DNS-320L%20Plex%20Package%20v1.07_06162015_UA