The official way to obtain this software is through the Oracle Technology Network (OTN) . Note that while version 11.2.0.2.1 is an older release, it is still sought after for legacy system compatibility. Difference between Oracle Client and ODAC - Stack Overflow

Based on Oracle’s original readme files, the ZIP (approx. 400–600 MB) contained:

and must accept the OTN License Agreement to access older files in the archive. Recommended Version

: Follow the Oracle Universal Installer prompts to select your installation directory and the specific components you need.

Launch setup.exe to start the Oracle Universal Installer (OUI) . Configuration: