Can you be more specific with the link; I searched that page for download as well as for network and it's not found. Which 'software' are you referring to?
Maybe some additional info will also help.
Which distro are you using?
Are you trying to connect via wireless or wired?
For me, networking always has 'just worked' (ubuntu, crunchbang, slackware), so I'm not sure at this stage.
You can run the below command (in bold) in a terminal to determine the networking hardware.
wim@aa0:~$ lspci |grep -i net
02:00.0 Ethernet controller: Realtek Semiconductor Co., Ltd. RTL8101E/RTL8102E PCI Express Fast Ethernet controller (rev 02)
03:00.0 Ethernet controller: Atheros Communications Inc. AR5001 Wireless Network Adapter (rev 01)