Hi, Amazon AWS doesnt state wich version it runs. It simply offers it as a service where you select rules and routes and then gives you an .ovpn file. This file i give to my clients, they upload it in openvpn client and connect.
This is an example of the file:
client
dev tun
proto udp
remote (mydns) 1194
remote-random-hostname
resolv-retry infinite
nobind
persist-key
persist-tun
remote-cert-tls server
cipher AES-256-GCM
verb 3
<ca>
-----BEGIN CERTIFICATE-----
my certificate
-----END CERTIFICATE-----
</ca>
auth-user-pass
reneg-sec 0