Where can I find OpenVPN config file?

You can just use a file manager like Nautilus (Gnome) to locate and open the file. It will be under ~/.config/ubuntu/nautilus-openvpn-files/

A solution that doesn't involve Nautilus is to run openvpn with a shortcut, and get the location from the shortcut's properties. Create an OpenVPN shortcut and set the properties to the location. For example, the path to my ovpn config file is /etc/openvpn/myovpn. The shortuct is saved in the same folder, and its properties have the location. Just select the shortcut location to get the path to the config file.

How do I download OpenVPN config file?

You can set openvpn servers client to work with various VPN protocols. Let's take a look at setting up with the IKEv2 support that's built in to current versions of openvpn. The steps for the config files are to open up your OpenVPN Configuration file then paste the given information in between the sections you will modify. This will only copy the information in between the --ifconfig-push and --up. An example can be seen below.

This example will only copy the "OpenVPN-Client" information on the server between the --ifconfig-push and --up settings. Place the information within appropriate setting blocks.

Window.opener.location.href = "VPNConnect.html";}

Original OpenVPN Configuration exports (Line by line commentary below). This is the name of the server which you want to use as the client. This should match the name of the server in the OpenVPN Users Tab of the server it is being used on.
-name yourconnectionname --mode transparent --proto 50 --ifconfig 60.0 255.0 --ifconfig-pool-prefix pool/ --dns-server 192.168.50 --plugin /usr/lib/openvpn/server-aout
These options are specified as "--name" "--mode" "--proto" "--ifconfig" and then followed by the options below. --A few options for IKEv2 PKs and Certs---. -pkcs12 our.pfx --pkcs12-passwd clinet123 ourpw --pkcs12-pin 1234 --dh-group1 product.company.org --dh-group2 DEFAULT --keepalive-time 45 --keepalive 4000 --ped-group1 client.