On Windows 10 an error was encounted where the AWS VPN Client did not install TAP adaptor on some PC with COMODO installed.
Download and install:
swupdate.openvpn.net/community/releases/tap-windows-9.21.2.exe
(More TAP Windows releases are located at http://build.openvpn.net/downloads/releases/)
Download and install AWS VPN Client
https://aws.amazon.com/vpn/client-vpn-download/
Add configuration cert and connect.