Update the Theme
The easiest way to update the theme is to use Envato Market plugin.
Alternatively, you can download the installable lore.zip file from your ThemeForest account / Downloads and then either unzip it and upload it under wp-content / themes via FTP (overwrite the existing lore folder), or upload the file via admin under Appearance / Themes / Add New / Upload Theme (you will have to deactivate and remove your current version of the theme first).
You should update the parent theme only. The child theme is NOT supposed to be updated.