vSphere 6.5 requires VMware Tools to be signed by VMware. The signatures for VMware Tools are available only in version 10.0.12 and later. Installation or upgrade of VMware Tools older than version 10.0.12 is not supported on vSphere 6.5. VMware Tools versions 10.1.0 and 10.0.12 along with signatures are bundled with vSphere 6.5.
Note: For more information on VMware Tools version status for old versions on vSphere 6.5, see KB 2147440.
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