In my previous post, Oracle BI Applications 22.214.171.124 Now Available, I wrote that Oracle BI Applications version 126.96.36.199 are now available. What I did not include is the download link from Oracle E-Delivery.
Here it is: http://edelivery.oracle.com/EPD/Download/get_form?egroup_aru_number=9149012
So, when you select "Oracle Business Intelligence" from the product dropdown, from the resulting search list, click "Oracle Business Intelligence (10.1.3)...".
This brings you to a page with downloads for 10.1.3.x releases. Oracle Business Intelligence Applications 188.8.131.52 are part of that, because they require Oracle Business Intelligence Enterprise Edition 10.1.3.x version as the underlying platform.