After downloading, check the MD5 or SHA checksum (provided on the download page). A corrupted download leads to inexplicable installation failures.
Since Oracle Client 11.2.0.4 is no longer receiving security patches for client-side vulnerabilities, follow these mitigation steps: oracle client 11.2.0.4 download 32 bit
Many older ERP and CRM systems are 32-bit. After downloading, check the MD5 or SHA checksum
Right-click setup.exe and select "Run as Administrator." Select Installation Type: Instant Client: Smallest footprint, for basic connectivity. for basic connectivity.