Navigate to the under the Developer downloads section. Look for legacy ODAC releases matching version 11.2.0.3.0 .
To help find the right setup for your environment, let me know:
Oracle recommends using the latest stable versions from their Official .NET Downloads page for modern security and patches. However, if you specifically require version 4.112.3.0 for legacy compatibility, you should look for archived installers: Oracle.DataAccess.dll ODP.NET vs Nuget package - GitHub oracle.dataaccess.dll version 4.112.3.0 download
Check your IIS Application Pool settings. If "Enable 32-Bit Applications" is set to True , make sure you have the 32-bit version of the Oracle client installed.
If you have a valid Oracle Support contract, you can locate specific patch numbers (e.g., ) that update ODP.NET to 4.112.3.0. This is the most precise way to get the exact build matching your environment. Navigate to the under the Developer downloads section
This happens when a 32-bit application tries to load a 64-bit DLL, or vice versa. Ensure your project's platform target (x86/x64) matches the installed Oracle client architecture.
: If you don't want a full install, download the Instant Client with SDK for 11.2.0.3, which includes the necessary OCI files to support the DLL. Common Issues & Fixes However, if you specifically require version 4
If you are modifying or updating this legacy application, consider migrating away from Oracle.DataAccess.dll .
Oracle.DataAccess.dll version 4.112.3.0 is part of the ODAC (Oracle Data Access Components) 11.2 Release 4 (specifically 11.2.0.3.0). It is an older but still widely used version, especially in legacy enterprise applications.
string connString = "User Id=scott;Password=tiger;Data Source=ORCL;"; using (OracleConnection conn = new OracleConnection(connString))
