If 11gR1 is not supporetd then why oracle is providing its installable.
Could you please ellaborate.
11gR1 downloadable is no more available. If you have a valid Oracle Support Contract, then raise an SR with them and they should be able to deliver the software media to you. The extended support for 11gR1 ends in Aug 2015.
May be this may help you out *Release Schedule of Current Database Releases [ID 742060.1]* to get to know more information about the release of database release.
As mention here just 11.2 release avaliable at OTN site. For previous setup you need to contact with your oracle local office or rise SR
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