Can’t connect to GPS receiver

I downloaded agopengps and I have a cheap GPS receiver that I tried to connect to but it keeps say the USB port does nt exist I tried all the USB ports but it makes no difference when I go into setting on the computer it says the USB port is working ok any ideas appreciated

What gps reciever is it?

It is global sat bu 353s4 it came with a guidance system I bought years ago that never worked properly
I just wanted to try it out to see if I could get the hang of it
Would I be better off to buy an arduino simple and try that I just want light bar guidance at the moment as I don’t think I would be able to build full autosteer

It has very good reviews

it may need a driver installed on windows to be recognized by your computer. I started with a tablet and f9p and eventually built the system it is a good start.

It did come with a driver on a mini cd tbf but I have no cd drive
What sort of accuracy did u get with the tablet and arduino without rtk