To download RHEL 4 ISO, you'll need a valid Red Hat subscription. If you don't have one, you can create a free account or purchase a subscription from Red Hat. Keep in mind that RHEL 4 is an older version, and support for it may be limited.
Some popular third-party sources for RHEL 4 ISO include:
: Some university and research institution mirrors still hold old ISO files, though many have purged files older than RHEL 6 to save space. Key Technical Specifications of RHEL 4
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If you're unable to download RHEL 4 from the official Red Hat website, you can try searching for third-party sources. However, be aware that: