Setup Raspberry Pi 3 B+ as PC - Just not getting it

you need to install the Easel Local driver.

What you are installing is an Easel Local driver for Linux which is an AMD64 driver or simply put a driver that is compiled for a CPU with AMD64 instructions.

What you need for the raspberry Pi is a program that is written for the ARM 64 architecture.

if you want to run the raspberry (which I highly recommend) then you need to compile your own driver as outlined in this post
Easel Local for Linux? - #17 by SamyKamkar