vmware 6.5 upgrade failed with no space left on device

I was running the upgrade on my HP microserver Gen 8 ESXi host, and it threw an error:

[root@esx1:~] esxcli software profile update -p ESXi-6.5.0-20171004001-standard -d https://hostupdate.vmware.com/software/VUM/PRODU
CTION/main/vmw-depot-index.xml
[InstallationError]
[Errno 28] No space left on device
vibs = VMware_locker_tools-light_6.5.0-0.23.5969300
Please refer to the log file for more details.
[root@esx1:~]

I ended up having to install the locker tool first:

cd /tmp
wget http://hostupdate.vmware.com/software/VUM/PRODUCTION/main/esx/vmw/vib20/tools-light/VMware_locker_tools-light_6.5.0-0.23.5969300.vib
esxcli software vib install -f -v /tmp/VMware_locker_tools-light_6.5.0-0.23.5969300.vib

Then I ran the update, and it worked perfect!