How to install BETA PMS Version Available - 1.31.1.6716-ca0c45ff8

how do I download the BETA PMS for my Synology DS920+?

I am on the website and I don’t know which. version I need

Intel 32-bit
Intel 64-bit
ARMv8
ARMv7 x13
ARMv7 X15

The DS920+ has an Intel Celeron J4125 as its CPU. That’s an x64 architecture → Intel 64-bit

great thanks!