There's a WRG614. The port forwarding site's got a few versions listed but not a version 4, there's a v5 & v6. I'm guessing you'd just have to use the plain ol' 614 instructions so here they are
http://www.portforward.com/english/r...4/Limewire.htm

Don't forget to set up a static IP address first, there's a link (in red) for this within that set of instructions.
After you do that & set up port forwarding, go to LW's tools > options > advanced > firewall config. Choose the 'manual port forward' option & enter the same port number as LW's listening port > apply.

No, limewire still doesn't seem to work... x_x

Did you make sure to set up a static IP address first?
Did those router pages in the port forwarding instructions look the same as the pages you saw when you logged into your router (remember, there weren't instructions for the v4)?

Yes, the router pages look the same... o.o What is a static IP address? [sorry...]

It's an IP address that doesn't change. You'll need to set one up so that port forwarding can work through your router & then you'll need to type that static IP number into the router's config pages (as shown in the port forwarding instructions). Don't worry, it's safe!

If you go to the link below, there are instructions for setting this up. Make sure to write the static IP down as you'll need to know it!
http://www.portforward.com/networking/staticip.htm