The AstDisplay Application is (and has been for a few months now)
maintained in a SVN repo located at http://dynx.net/svn/display/

To pull a current copy just do the following.

cd /path/to/your/docroot				(eg. /var/www/html)
svn co http://dynx.net/svn/display/trunk display 	(this will create a display dir off your docroot, be careful)
cd display

edit the AstDisplay.properties
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make sure 'trunk' is set to the *base* of your IAX2/SIP trunk (if you use one, else leave as is).

make sure your asterisk manager info matches the user/pass you have for the display.

make sure you htaccess this application (it is not that complicated), as you do not want this 
application just available to everyone.