VMWare: vCenter 6.5 Upgrade Fails with VIX error

I had to upgrade vCenter from 6.0 to 6.5. It’s not the first one, I made a few recently cause we have a client with many sites that should be upgraded. Everything was good prepared or at least I was thinking so and I was ready to start. In the evening, after the working hours as it was planned, I’ve started and quite soon, at the 3rd step of stage