One other thing to consider is that printer ports could have a few different modes eg original, EPP or ECP.
Perhaps your Ugreen driver detects this automatically but if not, open up "Davice Manager", right-click on the Ugreen device (probably grouped under Ports), click properties and then have a hunt around in Settings or Details for the mode and set it to ECP if the option is available.
As mentioned earlier though, if the Ugreen device is not mapped to LPT1 or LPT2, then sorting that out is your first step.