VyprVPN Desktop is currently compatible with Windows 7, Windows 8, and Windows 10. It is also compatible with Mac OS X 10.11 El Capitan and greater.
For OS X 10.7 Lion and 10.8 Mountain Lion, you will need to use the last supported version of VyprVPN.
For OS X 10.9 Mavericks, you will need to use the last supported version of VyprVPN.
For OS X 10.10 Yosemite, you will need to use the last supported version of VyprVPN.
If you need any further assistance, please contact our 24/7 Customer Success Team, who would be glad to assist.