Kate.
You will probably have to remove (temporarily) your auto update settings.
Remove the setting, re-boot the PC.
Then go to the update site, remove the download check-mark, expand the notification by clicking on the text if needs be then place a check-mark in the "Do not show me this update in the future" option.
Once you come out of there, you should then be able to re-store your auto update notification and should not be notified of it again.
However, it does not really do anything and is a tiny download, so you could even download it, then select the browser that you are already using as your default, or even just delete it.
This update from MS is to conform to EU rules and is mainly for people receiving a new PC.
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