Download thunderbolt driver for mac pro 3,1

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This could be caused by third-party software like Jamf Pro or by the secuirty settings of macOS. If it says No, the driver might be blocked due to security reasons. Important information for macOS High Sierra (macOS 10.13) and above

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Click Continue and follow the installation wizard.Locate the downloaded file in the Finder, control-click and select Open.