Curtiss Hawk III

When I click on the download link for Erik Hertzberger's Curtiss Hawk then the download link that pops up in a new window it says
"Incorrect file parameter. Please contact system administrator to fix this error"
Please can someone help me I really want to download it.
"Incorrect file parameter. Please contact system administrator to fix this error"
Please can someone help me I really want to download it.
