Unable to install drupal 7 snapshot

I've purchased a template from a site which is for drupal 7. I've been given instructions on how to go about making my site appear as theirs did in their live demo. I'm having problems setting it up.. Here are their instructions: ------->To make your Drupal look like our live demo please, copy and replace sites folder to the root folder of your Drupal installation. Copy demo_profile folder from sources\ to profiles\ folder of your Drupal. Then begin installation, select Demonstration site profile and follow the instructions. Also you need to copy and replace install.inc file to includes folder and system.install file to modules\system\ folder. After installation completed administrator login is admin and the password is admin123. You can easily change it to your own in admin settings.<------

I have done this but when i go to install drupal and choose the demo profile I am getting an error that sais 'Snapshop field is required" I'm not sure what this means but I cant see a snapshot field. I'm finding it difficult to find any documentation on how to correct this. I've attached a screen shot of my fault. Does anyone know what this is about?