This is not linked to Invizible Pro. Most VPN providers, like ProtonVPN, support both the Wireguard and OpenVPN protocols. So if you want to use the Wireguard or OpenVPN client without the provider’s own client, you can choose to download a VPN server profile and add it to the above mentioned clients. A profile like this is what you can add to RethinkDNS’s app to route your traffic on a per-app basis through the VPN. @attempty’s reply mentions this.
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