Hi SwissMiss,
1. "Security-only Quality Update rollup" is included in "Security Monthly Quality Rollup", if you installed the later one, then, there's no need to install the other one;
2. If you only want Security and Critical Updates, then you may install "Security-Only Quality update rollup";
3. Since it's November, you may install November Security only quality update rollup;
4. It's recommended to install the update in a test environment before deploying it to production environment.
Best Regards,
Anne
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