Sure... here's the link: http://www.oracle.com/technology/software/products/ids/htdocs/101202winsoft.html Oracle Designer is part of Oracle Developer Suite 10g (10.1.2.0.2). You must download the Windows version. There is a linux version but it does not contain oracle designer, which is the software I'm interested. Perhaps you must suscribe for free at Oracle Technology Network to make the download. Oracle let you download all the software you want for study purposes, so go ahead.
