Oracle JD Edwards EnterpriseOne 9.1 Standalone has been released on March 16th 2012. Both 32bit and 64bit versions of the Standalone are available. This would help relatively for those who have the 64bit OS’s installed on their machines. This version of the Standalone Client supports only the Oracle Enterprise Edition (OEE) as the local database.
You can download the 9.1 Standalone/Demo from the edelivery.oracle.com site.
As of writing this post, only the 64bit version of the E9.1 Demo is available for download.
To get this, login to the eDelivery site using your Oracle credentials, and then search for JD Edwards EnterpriseOne / MS Windows x64
The complete installation steps for the E9.1 Standalone/Demo are given in the link below.
Marcelo Santos has written up the summarized steps (for those who fret over reading Oracle docs) for JD Edwards Standalone 9.1 Installation here