NetExtender is available for free and can be downloaded from both SonicWall.com and from the Virtual Office on the SonicWall firewall.
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Download NetExtender via SonicWall.com
Another option is to download NetExtender via the Virtual Office page:
In order to download NetExtender from the Virtual Office, the SonicWall SSL VPN feature must be enabled.
1. Navigate to any public or private IP address which the SonicWall will accept user logins from and append the port number used for the SSL VPN feature.
EXAMPLE: If your SonicWall is reachable via 1.1.1.1 from the WAN, and your SSL VPN is setup to use Port 4433, you would navigate to https://1.1.1.1:4433.
TIP: If you're unsure whether or not an IP Address will accept User Logins, navigate to Network | Interfaces and select Configure for the Interface in question. User Login is a checkbox on the resulting pop-up window.
2. Login with a Local or LDAP User who belongs to the SSLVPN Services Group. Select Click here to download Windows NetExtender Client. Once downloaded, move onto the Installing NetExtender step below
After download NetExtender from either MySonicWall or the Virtual Office page, it's time to install
Further reading: