Apple's newest MacOS, Big Sur, is expected to be released during the Autumn season, however, a beta is currently available for developers and testers. Please Note: current beta versions of Big Sur have been identified as incompatible with FortiClient. A 'Legacy System Extension' error is presented to the user upon launching the application which then fails to load.
FortiNet are aware of the situation and we will share any further information as and when we receive it.