Grabbing a copy from CVS is not as hard as it may seem. You will need to have a cvs client installed. Then try the following commands:
export CVSROOT=':pserver:anonymous@cvs.phpgroupware.sourceforge.net:/cvsroot/phpgroupware'
cvs login (just hit enter when prompted for a password)
cvs checkout phpgroupware
export CVSROOT=':pserver:anonymous@cvs.phpgroupware.sourceforge.net:/cvsroot/phpgroupware'
cvs login (just hit enter when prompted for a password)
cvs checkout -d dirname phpgroupware