There is no official site for i2Phex. The only official place is the forum I posted the link to.
Can you use subversion?
Then you can just checkout the i2phex branch in the Phex Subversion repository.
$ svn co
https://phex.svn.sourceforge.net/svn...ranches/i2phex
About subversion:
http://wiki.phex.org/Subversion