is the network cable (ethernet) connected directly to the computer from the pokeys controller?
if so, you need to manually assign a static ip address in windows network config.
the manual says it needs to be in the range of 192.168.###.###, so 192.168.0.20 should work fine.
then in the pokeys configuration software you just put that same ip address for the controller.
here is a link to a good guide for setting a static ip address in windows:
https://www.tp-link.com/us/support/faq/919/
if the motion controller is not directly connected to the computer (ie through a switch or router) it should just automatically assign an ip via DHCP.