This is often the specific patchset number used to find the 11.2.0.4 installation files on the support portal.
This is the easiest to obtain for basic connectivity (OCI, OCCI, JDBC). You can download the Instant Client for Windows 32-bit directly from . Look for the file named instantclient-basic-nt-11.2.0.4.0.zip Full Client (Graphical Installer): oracle client 11.2.0.4 download 32 bit
tnsping ORCL