Installation problem: When I try to upload the zipped file, I receive the following error: "Are you sure you want to do this? Please try again."
Some users have the same problem than you using the Wordpress Panel to install the theme. This is usally caused because you have a maximum file size upload limit set too low and the theme file you are tying to upload is bigger than this setting. (Theme file is around 10-12mb). You can change the maximum file size setting if you talk to your webhost, or here is another solution:
Install the theme manually by FTP.
follow this instructions:
Once installed, don't forget to activate the theme in WP-Admin panel control.