Hello, Thank you for contacting Mozilla VPN Support! Currently, the Mozilla VPN macOS client is only compatible with versions 10.14 and up computers. We offer a 30-day money back guarantee so you can try Mozilla VPN risk free. If you purchased Mozilla VPN through an app market (App Store, Google Play, and other app markets) your purchase is subject to that app market's rules and might not qualify for a refund. You can find out more here: * Bulleted list item[[How do I request a refund for Mozilla VPN?]] I hope you may find this helpful,