Cannot Manual Install on Synology DS218J

Server Version#: 1.13.4.5271-200287a06 on Synology NAS DS218J
Player Version#: ?

I am a new Synology DS218j / Plex Premium Pass user. I love using Plex on my NAS, it has been a wonderful experience thus far.

I just saw the announcement about Plex Premium Pass:

Starting July 1, Plex Media Server version 1.15.8 or higher will be required to continue to add music to Premium music libraries.

I noticed that my Plex Package install on my DSM is v1.13.4.5271-200287a06

So I attempted to download the Plex Package from the Plex download page for my NAS which is ARMv8 18 series.

I am getting the following error message:

"This package is not supported on the platform of DiskStation or is not compatible with the current DSM version."

My DSM is the latest version: DSM 6.2.2-24922

I have also tried to download and install the version from the server update in Plex Web and get the same message.

What can I do to update to PLEX v1.16.0.1226

Thank you.

Best,
Dameon