VMware Tools ISO images on the host might be downgraded during an ESXi host upgrade when the following conditions are met:
The ESXi host upgrade completes successfully with tools-light VIB upgraded to the bundled one. However, ESXi host ends up with older version of VMware Tools ISO images.
This is a known issue affecting ESXi 6.0, 6.5, and 6.7. Currently, there is no resolution.
To work around this issue, use one of these options:
Download and install the latest VMware Tools offline depot.