Only 126.96.36.199 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 - 188.8.131.52.0 to 184.108.40.206.0 is Not Certified / Supported on Microsoft Windows Server 2012 R2
Only Oracle Database 12c (220.127.116.11 and higher is Planned to be Certified on Microsoft Windows Server 2012 R2
Could you please confirm that 11g client (x86 or x64) is not certified on Windows server 2012 or Windows server 2012 R2 ?
Windows 2012 - Minimum 18.104.22.168 client is required
Windows 2012 R2 - only 12c client/database is certified