If you do not have a support contract, Oracle’s public page sometimes retains older versions. While 11.2.0.4 is rare there, you may find the 12.1 or 11.2.0.1 versions which occasionally offer backward compatibility. System Requirements and Compatibility

The keyword here is Downloading the file is easy. Making it work —resolving path conflicts, SQL*Net configuration, and ODBC driver registration—is the hard part. This article covers every step.

Navigate to C:\oracle\product\11.2.0\client_32\network\admin . Create a new text file named tnsnames.ora . Add at least one entry: