If you are upgrading from a version earlier than 1.7 please read the following:
The "Slide URL" and "Link Type" slider settings will need to be reapplied for individual slides.
The "Audio/Video URL" gallery image setting will need to be reapplied for individual images.
Changelog from version 2.3 to 2.4 (15-May-14)
Update: Updated TGM plugin class to v2.4.0
Update: Included child theme folder
Update: Removed [video] shortcode as WordPress provides native [video] shortcode now (you can revert to the old [video] shortcode from Appearance -> Theme Options -> General Settings -> Old Video Shortcode)
Tweak: Adjusted browser page title tag
Tweak: Added SSL support for Google SWF library
Tweak: Plugins can now be activated when the child theme is active
Fix: TinyMCE shortcode generator now works with WordPress 3.9
Fix: Lightbox option not set by default in Posts, Related Posts and Slider shortcode for older posts/slides now