Compare output to the checksum listed on the download page. Warning: Only for lab environments. Not official.
Which format do you actually need?
# Linux/Mac shasum -a 256 VMware-VMvisor-Installer-6.5.0.update03-xxxx.iso Get-FileHash VMware-VMvisor-Installer-6.5.0.update03-xxxx.iso -Algorithm SHA256 esxi 6.5 download iso
6.5.0 Update 3 (Build 19193954) – final release. Step 4: Verification (SHA256 Checksum) After download, verify integrity: Compare output to the checksum listed on the download page