Can you unzip the theme zip, delete/move the plugin files inside the folder inc/lib/plugins folder of the theme, compress the folder again to reduce the zip size and try uploading the same to the server? That should reduce the file size from about 13 MB to 5 MB or so and hopefully the upload will get through. You can always upload the plugins manually.
If that above does not help or results in an error, can you pls email us the temp login details via our profile page contact form – https://themeforest.net/user/livemesh#contact. We will take a closer look at the issue and get back to you.