there is no specific version of newton attached to Mogre 1.6.2. if you want to use a specific version of newton, you have to compile the associated ogrenewt version (1.53 or 2.0) against it. some minor change could be needed to the source code of ogrenewt (I haven't test the 1.53 version).
some information on compile latest ogrenewt against Mogre 1.6.2 here
Do you know where can i get MogreNewt 1.53 source. There is a Wiki page but you need login and password to download SVN repository. (so login and password will do either).
you don't need any login and password to download from the repository, just do a svn checkout with tortoise and copy/paste the good url.
if tortoise ask you for a login/password pair, try to see with bekas what's wrong, since he is the project admin. but if you just do a checkout, it will work like any other sourceforge project
Ok i have downloaded it. It was asking for a login when i was trying to do import.