If you wish to obtain an official stable release of E, see the Downloads page.
The E sources and the erights.org website are both maintained in Subversion. If you have a Subversion client, you can check out the latest E sources by doing, for example,
$ svn co svn://svn.synchrona.org/erights/e/trunk e
You can obtain the erights.org website by doing
$ svn co svn://svn.synchrona.org/erights/doc doc
With the TortoiseSVN client, you can simply click on the svn: links above to check out these source trees.