Don't race out & buy another Pro!!

Your version of LW's pretty old, but I just fired up my 4.9.30 Pro & it connects fine.

Have you been through the fixes in this link? If LW Will Not Connect

First thing I'd try is replacing your gnutella.net file. Next thing I'd try is deleting LW's preferences folder. After that, go through the other fixes & see if anything helps.

Did you set up a static IP address for your computer, before you set up port forwarding for your router? And did you use these instructions: Port Forwarding for the Uniden WNR2004

There's a link within those instructions for setting up a static IP address. You need to do that first, before port forwarding.
LW's listening port, port in the 'manual port forward' box & port forwarded within your router setup must all be the same number

4.9.30 was released in 2005... if you bought Pro around that time then your Pro benefits expired long ago!! So your email address won't be in LW's database any more & you're not eligible to download free Pro updates.
Back then, buying Pro entitled you to 6 months worth of free updates & email support.