Viscosity software version 1.4.8 is a VPN client for Mac and Windows that provides secure and reliable connections. It supports OpenVPN and a range of other VPN protocols, including PPTP and L2TP. It has advanced features such as DNS leak protection, automatic connection on startup, and split tunneling, allowing users to control which traffic goes through the VPN and which doesn't. Finally, Viscosity 1.4.8 has a user-friendly interface that makes it easy to set up and manage VPN connections.