Need Help: Update to V 1.7

I purchased and downloaded your Highend Theme from MOJO in August and installed it myself. The version that was installed is: 1.6.1 Apparently, version 1.7 is released. The auto update in WordPress never indicated that V 1.7 was available to update. I want to update the theme, but after looking around in this support forum, I cannot find a way to update to 1.7. Why isn’t WP notifying me of the update? How can I obtain 1.7? The version of WP installed is 4.0 I may need some customization assistance. Please help. Thank you.