Hi Lilyan,
The Ontarget website does suffer from server overloads from time to time and perhaps thats what you experienced. You could also try a different browser or ensuring that 'cookies' are enabled in the browser you are using.
I'm sorry but, while i understand it might help you, I wouldnt feel very happy about uploading someone elses copyrighted work for distribution without their aproval.
However you can contact 'ranman38' , the author of the uniform, by logging into the Renderosity site and going here - http://www.renderosity.com/homepage.php?userid=210421 - use the 'contact button on the right to email them. Perhaps they can assist you further.