I think it has been removed from edelivery.
If you have an environment of 126.96.36.199 installed, you may install it from workspace (click on Links after logging in to workspace and you may be able to see financial reporting studio)
In order to be able to install the FR studio from Workspace, you should have move the installation file to the appropriate foundation folder (I don't recall at the moment).
You must be able to find the installation file of version 188.8.131.52 at the zip file: Oracle Hyperion Financial Reporting, Fusion Edition Release 184.108.40.206.0 either from e-delivery.
In 220.127.116.11 the FR studio is installed by running the installer(installtool.cmd/installtool.sh) and selecting the FR client .Before that you need to have the files downloaded for 18.104.22.168 :
Oracle Hyperion Enterprise Performance Management System Installer
Hyperion Enterprise Performance Management System Foundation Services Release 22.214.171.124.0 Part 1 of 4
Hyperion Enterprise Performance Management System Foundation Services Release 126.96.36.199.0 Part 2 of 4
Oracle Hyperion Financial Reporting, Fusion Edition Release 188.8.131.52.0
Oracle Hyperion Financial Management, Fusion Edition Release 184.108.40.206.0
These are the required files.Currently you will not get these in the Oracle E-delivery. You need to raise a non-technical Service Request for the files with Oracle for these.
Hope this helps.