Your form tag:
html:
<form>
does not set the forms method, or encoding type.
For file uploads to work, the forms encoding type must be set to multipart/form-data. Also, the forms method must be set to post. it's good practice to include an action, name and ID as well:
html:
<form action="" method="post" enctype="multipart/form-data" name="uploadForm" id="uploadForm">
Your form contains two submit buttons:
html:
<input type="submit" name="submit" id="submit" value="Submit" />
</label>
</p>
<p>
<input name="download" type="submit" value="download" />
Digital File Pro is set to trigger on the one name d submit:
html:
<input type="submit" name="submit" id="submit" value="Submit" />
Viewing the source indicates that the page breaks wherever the generated php code falls. 
can you provide the text of the error when you view the source? The code should go at the top, so to tell what is going wrong, we will need to know the error.
