It depends on what your needs are. Basically, Windows 10 already have a built-in VPN. You can configure this free, built-in VPN on Windows to securely access your files from one computer to another. However, the built-in Windows VPN lacks so many features. For example, you cannot use advanced features like split tunneling and port forwarding. Moreover, this built-in Windows VPN can only be used for secure file access. It supports only a few protocols like PPTP, L2TP/IPsec, SSTP, and IKEv2 protocols. If you want to use the OpenVPN protocol, then you will need a separate VPN client. All in all, if you only want to securely access files using a VPN from one system to another, then you don’t need to buy a paid VPN on Windows . However, if you have other needs like secure and encrypted internet access, hiding IP addresses, changing location, and unblocking content, then you will surely need a paid VPN on windows.