For those of you still running ESXi6.0, be aware that it goes end of life on 12th March 2020. If you haven’t already started making upgrade plans, you should.
VMware try really hard to notify customers but sometimes the messages don’t get to the right people within an organisation.
My advice is bookmark this link and review it regularly and set reminders for yourselves
I also speak to quite a few customers who will only upgrade to the next version which in this case is 6.5. Unless there’s a compelling reason not to, my advice is to always consider the latest ie 6.7
Goof luck with your upgrades…