This is probably a noob issue, but I am having trouble installing this theme. I had it working on a previous version of my Drupal, and a fresh install of Drupal appears to be working fine. But, when I attempt to install this theme, I get:

Internal Server Error
The server encountered an internal error or misconfiguration and was unable to complete your request.

Please contact the server administrator to inform of the time the error occurred and of anything you might have done that may have caused the error.

More information about this error may be available in the server error log.

I can only think that I don't have a relevant module included to make this work, but I can't find the required modules for this theme anywhere.

Could someone let me know:
1. If there are required modules for this, and what they are?
2. If they have any suggestion as to why this is not working? The error message is not particularly helpful.

Thanks in advance.