I made the mistake of creating a Windows VM and believing their minimum required disk space figure of 64GB. It won't upgrade. Asks to attach an external USB drive because it lacks enough space. It hasn't anything added to it, only some bloatware removed. Attempting to upgrade takes hours, fails (despite attaching the extra storage), then restarts the entire download and install process over again. I can only assume it's incapable of caching and verifying downloaded content. There's no offline installer option, like we used to have with service packs. The whole thing is slow as molasses yet it doesn't max out the 8(!) CPUs allocated to it. The host has plenty of spare capacity. It's a steaming pile of shit.