Please do not provide links outside of this forum. Just fetch the *.deb and install it with
sudo dpkg -i filename.deb.
This post only provides links to Plex Pass releases. For public releases please use my repository.
This package works quite well on native ARM64 distributions, just enable the armhf multiarch support (tutorial).
Official instructions for Plex Media Server on the Raspberry Pi 2 and 3 / Banana Pi / ODROID / many more : armhf and arm64 Debian Repository
My PMS hardware: RPi 2, NVIDIA Shield TV, Intel Xeon