@rufunky : Something that needs to be pointed out is this:
OpenVPN DOES sell a VPN service that you must pay for, and which is the type of VPN you DON'T want for this application. I'm sure it's a fine VPN service.
But, they also give away for free their OpenVPN client software that many of us use to connect to the VPNs that we run on our systems at home (or wherever).
I ran into this only when I was first setting up OpenVPN on a PC I have at work. I had already set up the VPN server on my Asus router at home, and had installed the OpenVPN client app on two phones. None of that was confusing, and at no time was I faced with two possible choices of what to download and use.
But when setting up that Windows PC to have an OpenVPN client, so that I can view my security cams from work (or access anything else on my home network securely), I ran into the snag to which the OP is referring.
In fact, I downloaded and installed what I thought was the correct OpenVPN program on that PC, only to find that it then needed me to subscribe to their paid VPN service. And, of course, that wouldn't have done me any good, anyhow.
So I had to uninstall that program and then find the OpenVPN client that I actually needed. Once I did that, and set it up with a username and password on my router at home, and then exported the encryption key and installed that on the PC, it works like a champ.
Indeed, it's free. And it lets me securely access my home network from work on that PC, just as the Android OpenVPN client app lets me connect from anywhere on my phone and my wife's.
There are good reasons to use a VPN service, as well. But for accessing your home (or whatever) LAN securely, from anywhere, you need to set up your own VPN server, at your home (or whatever).
So we all need to be aware that when you visit the OpenVPN website, what you're most likely to run into first, is their paid VPN service. I am not at a PC now, but somewhere, I think I have a link that will get you to where you need to be if you want to download the VPN client that you need to access your home VPN server from a windows PC.
I don't remember it being hard to find the phone/tablet app for it. It was either the first, or the only OpenVPN app. But finding the same thing for a PC was confusing to me.
And keep in mind that you only need the OpenVPN client for a PC if you want to access your home LAN remotely on a PC somewhere outside of your home LAN (like me viewing my home cameras from a PC at work).
It's something you would likely want to put on a laptop PC so you can check your cams from anywhere when traveling, for example. You could also use it to securely surf from, for example, a hotel or airport WiFi which would otherwise be highly insecure!
That's one of the advantages of any VPN. But with your own VPN set up at your home, you can view your cameras as well as, surf, stream, or whatever, and it's the same as if you were at home logged into your own WiFi.
It works like a charm, by the way. But I have upload speed of at least 10Mbps, and download speed of 100Mbps at home. I can also stream Netflix, Hulu, Amazon Prime Video, etc., through the tunnel, too, and at least at 1080P, it appears to be no different than when I do this directly via the ISP at work.
It's a bit silly to do it, but it shows that the feed can download to my house, be encrypted by the router, piped back out through the upload side of my ISP at home, then download that encrypted stream at work, and have it decrypted and then shown on my PC at work. And it's pretty lame PC at work, so it kind of amazes me.
This may not be as impressive as streaming the camera feed from home, actually, but all of this is just amazing to me.
Anyhow, be careful which product you download from OpenVPN if you're looking for the PC client that you need for accessing your home VPN server. It was confusing to me, too!