If you have located an ESXi 4.1 ISO file (typically named similar to VMware-VMvisor-Installer-4.1.0-XXXXXX.x86_64.iso), follow these steps to verify it.

md5sum VMware-VMvisor-Installer-4.1.0-260247.iso
sha1sum VMware-VMvisor-Installer-4.1.0-260247.iso

For macOS (no md5sum by default):

md5 VMware-VMvisor-Installer-4.1.0-260247.iso
shasum VMware-VMvisor-Installer-4.1.0-260247.iso

If you provide more details, I can give a specific, actionable review.

You do not need to burn the ISO to check it. Use the command line on your workstation to generate the hash of the file.

On Windows: Open Command Prompt or PowerShell and navigate to the directory containing the ISO.

certutil -hashfile VMware-VMvisor-Installer-4.1.0-XXXXXX.x86_64.iso MD5

On Linux or macOS: Open the terminal.

md5sum VMware-VMvisor-Installer-4.1.0-XXXXXX.x86_64.iso
# OR on older macOS
md5 VMware-VMvisor-Installer-4.1.0-XXXXXX.x86_64.iso
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