Christian Bayle has posted 4.7beta installer, which you can download from the homepage of gforge.org - testing and feedback is needed to resolve bugs and issues.
GForge 4.6rc1 is posted and has simple installation backported from GForge AS. If you are on a current centos, redhat, debian or fedora, it should be relatively trivial to install this version.
GForge 4.6 Beta 1 is released and includes a new theme and the huge register_globals=Off patch by Ognyan Kulev, along with drastically simplified installation.<br /><br />Please download here and report any bugs you find:<br /> http://gforge.org/frs/download.php/232/gforge-4.6b1.tar.bz2