Download Oracle Universal Installer Version 11.2.0.0.0 Here

# On Linux: Unzip and locate OUI without running DB install unzip linux.x64_11gR2_database_1of2.zip cd database/install/ ls -la # You will see: runInstaller, oui, libosdjni.so, etc. You cannot download oui.exe alone. You must download the full Database 11g Release 2 zip files from Oracle edelivery. For modern systems, use Oracle 19c or 21c instead.

This is a specific request, as is not distributed as a standalone tool. It is bundled inside the Oracle Database 11g Release 2 installation zip files. download oracle universal installer version 11.2.0.0.0