Home FAQ I can’t use the VPN on a Mac with an old version of MacOS PT Target Audience: Iscte CommunityDescription: Installation errors or extension blocking.Probable Cause:Too old mMcOSManual blocking of extensions by Palo Alto NetworksAnswer/Solution:Manually authorize the extension in Security & PrivacyConsult the specific instructions from Iscte ITUpdate macOS, if possibleFurther Information:Click here Related Previous The VPN does not work on computers with ARM processors Next The VPN does not work after the operating system update