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You see this pop up after installing Trend Micro Antivirus on your Mac:

Legacy System Extension

Why did this happen?

You need to update the program right away to improve compatibility with the new Mac operating system.

What should I do next?

Update Trend Micro Antivirus program components manually:

  1. Click OK on the Legacy System Extension window.
  2. Open Trend Micro Antivirus.
  3. Click Update Now.

    Update the program

    Wait as the program checks and downloads the updates.

    Checking for updates

  4. After the update completes, click Close.

    Update completed

Keywords: Legacy System Extension
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