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Due to the transition to Windows 10, some applications refuse to install and work normally. This is exactly what happened with the Cisco VPN Client, and more specifically with the latest released version of Cisco Systems VPN Client 5.0.07.0440. Here I offer you a solution to this problem.

Installing the Cisco VPN Client on Windows 10

After you have unpacked the distribution, you can run one of the two installation files: vpnclient_setup.exe or vpnclient_setup.msi. When you run the first file, you immediately get a message that the application cannot be installed and Cisco VPN Client does not work on this version of Windows.

And if you run the file vpnclient_setup.msi, then it will even start the installation, but it will break approximately in the middle of the process during the configuration of network components. I got an error «Error 27850. Unable to manage networking component. Operating system corruption may be preventing installation«.

But there is a solution. You need to install the latest update first DNE (Deterministic Network Extender), which you can download from the Citrix website here. You do not need to download everything, but only the necessary files: dneupdate.msi for 32-bit Windows or dneupdate64.msi for 64-bit Windows. If you have any problems installing DNE, it is recommended to uninstall all programs that use DNE (such as VPN clients), then use a cleanup utility winfix.exe and repeat the installation of dneupdate.msi or dneupdate64.msi.

After installing the DNE update, you can reinstall the Cisco VPN Client. You need to run the vpnclient_setup.msi file. My installation was successful.

Configuring the Cisco VPN Client on Windows 10

After creating the connection, I tried to connect to the server. But got the error «Reason 442: Failed to enable Virtual Adapter«.

This error occurs because the VPN client does not find the virtual network adapter (in my case Cisco Systems VPN Adapter for 64-bit Windows). It is corrected like this. Launch Registry Editor (regedit.exe), find the branch HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\CVirtAit has a value named display namewhich contains something like this:@oem172.inf,%CVirtA_Desc%;Cisco Systems VPN Adapter for 64-bit Windows«.

Change the value of this field (context menu «Change…» by the right mouse button) so that only «Cisco Systems VPN Adapter for 64-bit Windows» (for a 32-bit VPN client, this should remain «Cisco Systems VPN Adapter«).

After that, try to establish the connection again (it is not necessary to restart the VPN client). Everything worked for me without problems.