You can download the software from Cisco.com if you have a CCO account, you can get an account with the registration of a Smartnet or by registering yourself via the 'Register'-link at the top of the Cisco.com website.
Information and the download link for the VPN Client can be found here:
http://www.cisco.com/en/US/products/sw/secursw/ps2308/index.html
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Regards,
Michael