When using newly generated .ovpn files in Tunnelblick I keep seeing this... Warning: This VPN may not connect in the future. The OpenVPN configuration file for 'AirVPN_Europe_UDP-443' contains these OpenVPN options: • 'comp-lzo' was deprecated in OpenVPN 2.4 and has been or will be removed in a later version You should update the configuration so it can be used with modern versions of OpenVPN. Tunnelblick will use OpenVPN 2.4.7 - OpenSSL v1.0.2r to connect this configuration. However, you will not be able to connect to this VPN with future versions of Tunnelblick that do not include a version of OpenVPN that accepts the options.