Installation procedure:
    - in english
    http://www.picsengine.com/en/support/installation-guide
    - en français
    http://www.picsengine.com/fr/support/installation-guide

Update from 3.5 or highest
    - Upload the admin/ directory
    When all the files are uploaded, you need to log into your administration panel.

Update from a previous version between 3.0 and 3.2.2
    - Move the folder admin/cache and admin/conf at the same level than admin and pictures.
    - Upload the admin folder, the templates folder and index.php of the new version.
    When all the files are uploaded, you need to log into your administration panel.

Update from 2.1.2
    - in english
    http://www.picsengine.com/en/support/update-guide
    - en français
    http://www.picsengine.com/fr/support/update-guide