Requesting Demo Installation

Demo’s wouldn’t install automatically. Now when I do it manually, after a 5 minute lag time, I get the following message:

Internal Server Error
The server encountered an internal error or misconfiguration and was unable to complete your request. Please contact the server administrator and inform them of the time the error occurred, and the actions you performed just before this error. More information about this error may be available in the server error log.

However, once I go back to the page, I get this message… and have NO IDEA what it means:

Sorry, there has been an error.
File is empty. Please upload something more substantial. This error could also be caused by uploads being disabled in your php.ini or by post_max_size being defined as smaller than upload_max_filesize in php.ini.

I’ve wasted 3 hours on JUST THIS…. and on my birthday no less. PLEASE HELP!

Thanks!