The version of the Windows OpenVPN program you direct people to is old. There are newer versions available at the OpenVPN website. Why do you have different versions of the .ovpn files for different OSes when they are just configuration files for the OpenVPN program, which hides underlying operating systems details.
Dec 05, 2019 How to export client config file - OpenVPN Support Forum Mar 04, 2019 Openvpn Config Hidemyass 🍕AviraPhantomVPNPros+
VPN — Android VPN Compatibility | pfSense Documentation
Again see OpenVPN-Howto on how to set up the public and private keys. For Android, a great client which supports OpenVPN and TAP is the OpenVPN Client. It is not free, but absolutly worth every penny. For Windows I use the official client. My final client.ovpn (use this extension for android or windows) looks like this. client1.ovpn
How To Guide: Set Up & Configure OpenVPN client/server VPN
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