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Summary
Apple released macOS Catalina 10.15.4 in March 2020, and provided the 10.15.510.15.6, and 10.15.7 updates in the subsequent months. When these versions of macOS detect apps that use ‘legacy’ system extensions, they produce the following informational message:

Legacy System Extension.
Existing software on your system loaded a system extension signed by “McAfee, Inc.” which will be incompatible with a future version of macOS.
Image showing the Legacy System Extension dialog. The dialog has an OK button.

When you see this message, click OK to dismiss it.

Why do you see this message?
Your McAfee software uses a type of system extension known as a kernel extension (or kext). Apple identifies kernel extensions as ‘legacy’ system extensions that will not be supported in future versions of macOS. The message lets you know that your McAfee software must be updated before macOS ends support for kernel extensions.

NOTE: The message appears when a system extension first loads, and appears periodically while the extension remains in use. So, you might see this message multiple times as you use your McAfee software. To dismiss the message, click OK each time that you see it.

What is McAfee doing about this issue?
Although our macOS security products do use kernel extensions, there is no need for concern. The current versions of macOS still support kernel extensions. So, our apps continue to function normally on current versions of macOS, and protect your Mac from viruses and malware.

We plan to update our macOS security products with versions that do not use kernel extensions. Revisit this article regularly for updates on a release date.

Discover More help  How to fix macOS alerts when you run the McAfee 32-bit software first

Related Information
This message appears on Macs running macOS 10.15.4, 10.15.5, 10.15.6, or 10.15.7.

For more information about legacy system extensions, see this Apple support document: https://support.apple.com/en-us/HT210999.

See also:

Source : Official McAfee Brand
Editor by : BEST Antivirus KBS Team

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