In addition to the big news that Oracle BI EE 10gR3 is now available - which has been known for some time internally and externally by the code name of "Maui" - existing customers can also download the 126.96.36.199 patch from Oracle's eDelivery site.
On the "Media Pack Search" page select "Oracle Business Intelligence" from the first dropdown, and the platform from the second list.
You should get two search results; the second one is the one you need to click on if Siebel Business Analytics 188.8.131.52 is what you are interested in.
You have to agree to some Export validation T&Cs.
Different components are listed in the Media Pack - select some or all as you need.