I can not download the project files, I keep getting and XML error.
The zip file for this video does appear to be invalid. I checked the 1st video and 4th video and those seem to work. I've included direct links below.
Here's the one from the first video: http://treehouse-code-samples.s3.amazonaws.com/PHP/build-a-basic-php-website/s1v1.zip
This is the zip file included with the 4th video: http://treehouse-code-samples.s3.amazonaws.com/PHP/build-a-basic-php-website/s1v3.zip
I would recommend starting with s1v1.zip
You could start with s1v3.zip if you want but keep in mind that you'll be a few videos ahead of the teacher and you'll have to wait for her to catch up to where you are.
Let me know if you're able to get either of those working.