404 not found [Solved - IIS server limit]

[wahone]

Hi
I have now sorted your permissions out and it seems OK.
But I would recommend that you create a User Group called say Uploader with Registered as Parent. Then join those members who are allowed to create and edit Downloads to that user group. They will automatically be members of Registered UG.
At the moment anyone who is a member of the Registered UG is able to edit etc atricles and other parts of the site.  You may not want that in the long term. 
Having a separate UG for uploaders would also make it easy to implement the create but not publish a Download.

Colin

I think the advice is sound and will implement it soon Thank you so much   

[wahone]

You guys led me to the answer it was in the IIS Settings this wonderful artical walks you through it.
Increase IIS File Upload Limits http://www.owenwebs.com/2014/04/08/increase-iis-file-upload-limits/

[Arno]

Thanks for the update. 
I was sure that the reason must be wrong settings.