To download an AIX 7.2 ISO image, you must typically have a valid IBM entitlement, as it is proprietary commercial software.
entitlement for the specific hardware serial numbers you intend to use. Prerequisites for Download Valid IBMid : You must have a registered account on the IBM website Software Entitlement download aix 7.2 iso image
After the downloads, always verify its integrity using SHA256. IBM provides checksums on the download page. To download an AIX 7