Starting with macOS 10.15.4 the above “Legacy System Extension” message will be shown when Little Snitch is installed.
Little Snitch is a host-based application firewall for macOS. It can be used to monitor applications, preventing or permitting them to connect to attached networks through advanced rules. It is produced and maintained by the Austrian firm Objective Development Software GmbH.
→ Please read this blog post to learn more about why this message is shown.
Will there be an update of Little Snitch that’s compatible with macOS 10.16?
Yes. We are going to release Little Snitch 5 later this year, which will be compatible with macOS 10.16. → Learn more…
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Will I get the update for free?
Yes. All licenses sold now include a free upgrade to Little Snitch 5. In addition, customers who purchased Little Snitch 4 within a one-year period prior to the final release of Little Snitch 5 will also get a free upgrade. → Learn more…
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Will Little Snitch 4 run on macOS 10.16?
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Little Snitch 4 will not be loaded on macOS 10.16 by default, but there will still be an option to allow the loading. → Learn more…