I did both but kept getting the same message. I was finally able to download version 4.13.. but, it won't connect; there is only one green bar. I have norton antivirus and I went in and made sure LimeWire was allowed through the firewall, so I don't know what else to do. Sorry to be a pain!

Give us your system details
System details - help us to help you

1. OS version? vista home premium
2. What firewalls you have? Norton & Windows (windows is turned off)
3. How much ram? 1 gig
4. Hard Disk space available? ~80 gb
5. Connection type? (eg: dialup, broadband, cable, etc.) cable
6. Modem & router brand name & model numbers? linksys wrt54g version 6
7. Where are you trying to connect from (house, appartment complex, school, student accomodation, work, etc.)? house
8. What version of LimeWire (LW) & Java do you have? (Go to LW's menu Help>About LW...) Will show both LW & Java version. LW4.13, Java 1.6
9. Who is your ISP provider (Internet Service Provider)? atlantic bb
10. Do this simple test for us. Using your browser go here: http://www3.limewire.com:6346/ The page should say 'Your test worked!'. What happens when you go there? it says 'your test worked!'
11. Are you sharing the connection with other computers or p2p sharing programs? If yes, please give details of set up. YES. one other computer, desktop for family use
12. Is this a your 1st try at LW or is this a new problem with an experienced user. 1st try on this computer, have used the program before
13. Do you see a brick wall in front of the blue world icon at the bottom of LW's interface? yes

Sorry for the late reply....I'm painting walls here

Double check your Norton configuration, or even totally reconfigure it.
http://www.gnutellaforums.com/226610-post6.html
PortForward.com - Free Help Setting up Your Router or Firewall

Your router has an internal firewall. Try port forwarding. Have a look at this site, there's no WRT54G v6 listed but check the instructions for the other WRT54G routers & see if they look the same as yours config-wise.
PortForward.com - Free Help Setting up Your Router or Firewall

Don't forget the step of setting up a static IP (the instructions are all in there if you follow the link...it's not as complicated as it looks). LW's listening port, port in the 'manual port forward' box & port forwarded within a router all have to be the same number!