https://esxi-patches.v-front.de/ESXi-6.7.0.html#2018-10-16
https://vmiss.net/2018/10/17/upgrade-esxi-67-u1-vmware-vsphere-update-manager/
https://virtualizationreview.com/articles/2018/10/22/upgrading-to-vcsa-67u1.aspx
(in this case the Jan 2019 version of 6.7.0U1)
# Cut and paste these commands into an ESXi shell to update your host with this Imageprofile
# See the Help page for more instructions
#
esxcli network firewall ruleset set -e true -r httpClient
esxcli software profile update -p ESXi-6.7.0-20190104001-standard \
-d https://hostupdate.vmware.com/software/VUM/PRODUCTION/main/vmw-depot-index.xml
esxcli network firewall ruleset set -e false -r httpClient
#
# Reboot to complete the upgrade