Only 184.108.40.206 or higher is certified on windows 2012.
You can download it from MOS patch 13390677
This is a complete installation set.No need to install the base release.You need to download the first two zip files for RDBMS(refer READ ME)
Oracle 11gR2 - 220.127.116.11.0 to 18.104.22.168.0 is Not Certified / Supported on Microsoft Windows Server 2012 R2
Only Oracle Database 12c (22.214.171.124 and higher is Planned to be Certified on Microsoft Windows Server 2012 R2