Windows 8 安装配置 Cisco VPN Client
Just to update, the legacy Cisco VPN client (5.0.07.0440 for x64, 5.0.07.0410 for x86) is working for some people. You need to apply a small workaround as explained below

Open Registry editor by typingregedit in Run prompt

Browse to the Registry Key HKEY_LOCAL_MACHINE\\SYSTEM\\CurrentControlSet\\Services\\CVirtA

Select the DisplayName to modify, and remove the leading characters from the value data up to the last "%;" i.e.

o For x86, change the value data from something like "@oem8.inf,%CVirtA_Desc%;Cisco Systems VPN Adapter” to "Cisco SystemsVPN Adapter”

o For x64, change the value data from something like "@oem8.inf,%CVirtA_Desc%;Cisco SystemsVPN Adapter for 64-bitWindows” to "Cisco SystemsVPN Adapter for 64-bitWindows”

Try connecting again

Please do revert back if this solution does not work.