QFX10002-60C does not support Junos only upgrade. Instead, a vmhost upgrade must be performed for this platform.
Upgrade steps for this specific platform:
Download the vmhost image click here and look for QFX10002-60C
Copy the image into the switch to /var/tmp/
Run the vmhost upgrade command:
> request vmhost software add /var/tmp/junos-vmhost-install-qfx-x86-64-18.1R1.9.tgz
Reboot the device
> request vmhost reboot