All the credits should go to Christian Turri (aka Turribeach) for his investigations and willingness to share.
The Oracle Business Intelligence Documentation could be found in the Oracle BI Documentation Library
The Certification Matrix (Thanks to Joe Bertram als) could be found here.
Last but not least. Follow this link for the Oracle BI 11g Installation System Requirements.
A lot to read but a good place to start, before asking around.
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