“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 below 10mb in Wordpress. (Ironband is around 11mb) You can change it 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.

This question applies to IronBand - Music Band & DJ Wordpress Theme