Hi Ashley,
Thanks so much for letting us know about this.
The plugin is not available anymore from WP repository but we've just updated the theme on Themeforest and the plugin now will be able to install directly from plugins author github page.
On how to update the theme in your WordPress please take a look at our docs:
Bloggin' - Updating the theme
Wundermag - Updating the theme
Wonderblog - Updating the theme
Let me know if you have any questions.
Cheers!
Lazar
