Download v0.9.3 Source Code.
(as siemsen)
cd
export CVSROOT=:pserver:siemsen@cvs.tigris.org:/cvs
cvs login
.kZU4Q=B
cvs checkout -r release-0-9-3 gef/src
cd gef
ant package
Then, to make it available to argouml, copy ~/gef/lib/gef.jar to ~/argouml/lib.