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This question already has an answer here:

I need to upload the recent security update to CiviCrm 4.6.15, but I do not know how to or where to go to do same. I tried under extensions update but it did not work.

marked as duplicate by William Mortada, Laryn - CEDC.org, Chris Burgess, ErikH - CiviCooP, Allen Hutchison Aug 17 '16 at 16:10

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The Wiki has good instructions for each CMS:

If you are using Drupal/drush, you may also be interested in this thread.

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