You can find older ODAC releases, including version 11.2.0.3.0, on the Oracle .NET Downloads page or the ODAC 11.2.0.3.0 Install Instructions page.
: If your app is compiled for "Any CPU" but runs on a 64-bit OS, it will try to find a 64-bit Oracle client. If you only have the 32-bit client installed, the connection will fail. oracle.dataaccess.dll version 4.112.3.0 download
Locate (Release 4). The exact filename should be similar to: You can find older ODAC releases, including version 11