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Fix Windows Update Error 0x80070643 Installation Failed - Cloudflare SSL Flexible Redirect Loop Fix-How to Set Up Windows Defender on a Mac

Updated 2026-06-13 15:46:13macos-help
Fix Windows Update Error 0x80070643 Installation Failed - Cloudflare SSL Flexible Redirect Loop Fix-How to Set Up Windows Defender on a Mac
Before changing system settings, save your work and note the exact error text so you can compare results after each step.

Extra verification checklist

  • Restart the affected app after changing permissions or configuration files.
  • Test the same workflow in a clean browser profile or a temporary user account.
  • Compare the result on another network if the error may be connection related.

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