To download the AIX 7.3 ISO image, the only official and secure method is through the portal. IBM does not provide direct public download links for AIX installation media due to export regulations and licensing requirements. Official Download Methods 1. IBM Entitled Systems Support (ESS)
Once you have the ISO, you can proceed with several installation methods: AIX 7.3 Release Notes - IBM
Select the category and your specific version (e.g., AIX 7.3). Choose the desired ISO images or USB-ready images.
: Select "IBM Operating Systems" > "AIX" > "7.3" to find fix packs in ISO format. System Requirements for AIX 7.3