CMAK-based VPN client doesn't work after an in-place upgrade to Windows 10
This article helps fix an issue where CMAK-based VPN client does not work after Windows is upgraded to Windows 10 - all editions.
Original product version: Windows 10 - all editions
Original KB number: 4052854
After you upgrade Windows to Windows 10, version 1703 (Creators Update), Windows 10, version 1709 (Fall Creators Update), Windows 10, version 1803, Windows 10, version 1809, or Windows 10, version 1909, you can't start a Connection Manager Administration Kit (CMAK)-based Virtual Private Network (VPN) client.
To fix this issue, reinstall the CMAK-based VPN package.