Help with QNAP TS-251+ Software updating

In plex menu under SERVER / GENERAL setting, it show I am running Version 0.9.15.3 and next to that it says NEW VERSION available… Please install manually…
I got my older copy from the QNAP app site, I also was reading that should be the only trusted app I should use…???

Any HELP on how to install manually once the Update is downloaded…

THIS STILL ACROSS PLEX WHEN I START IT…

Version 0.9.15.3 An update is available. Please install manually. What’s New

Read the pinned FAQ in this forum, and link to it is also in my signature

/T

Just download the newest version for QNAP Nas on plex.tv and manually install it.

that is it ???for this on my qnas?? An update is available. Please install manually.