I think you defenitly have an issue with you scratch.
esxupdate: esxupdate: ERROR: An esxupdate error exception was caught: Traceback (most recent call last): File "/sbin/esxupdate", line 257,
Can you try to reboot your host and try again.
Then check here : VMware KB: Creating a persistent scratch location for ESXi 4.x and 5.x
Do you have the same build version of VMware installed on your hosts.
Regards,
Julien