It sounds like the free download manager you're using might be spoofing the referer headers whereas your implementation is not. The server might be restricting downloads of the file you are attempting to download to only be downloadable if the referer field is set to a specific value (i.e. A site on the server).
Have you attempted.
The 403 Forbidden error is usually returned if the user does not have a permission to view/ download a particular content.
I cant really gove you an answer,but what I can give you is a way to a solution, that is you have to find the anglde that you relate to or peaks your interest. A good paper is one that people get drawn into because it reaches them ln some way.As for me WW11 to me, I think of the holocaust and the effect it had on the survivors, their families and those who stood by and did nothing until it was too late.