The assembly is the 32-bit unmanaged ODP.NET provider associated with Oracle Data Access Components (ODAC) 11.2.0.3.0 . This version is typically required for .NET 4.0 applications connecting to Oracle 11g databases. Quick Download Options
If you install the full Oracle 11g (11.2.0.3) Client, this DLL is typically placed in the Global Assembly Cache (GAC) and the $ORACLE_HOME\odp.net\bin\4 folder.
Oracle does not provide standalone DLL files for security and licensing reasons. You must download the full ODAC bundle: Visit the Oracle .NET Software Downloads page. Version Match: Look for ODAC 11.2 Release 3 (11.2.0.3.0) .