I just installed Windows 10 1909 on one of my PCs. It’s apparently so light that it doesn’t even count against the install date of Windows.
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Going to install it tonight. I hadn’t even noticed that upgrading changed the installation data before.
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Well so I just noticed the update history, so I guess this sort of makes sense:
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Glad to see it. These bi-annual OS overhaul-style updates are untenable imho.
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There was a cumulative update for 1903 and that took a heck of a lot longer than the feature update to 1909. Install date still says May for me, which is when 1903 was installed. Can’t remember if I did an upgrade or fresh install then.
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Near as I can tell is that 1909 is just a small download that relabels the exact version you just patched into the new version.
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I just installed it on a very old, very slow machine (a Dell E1405) and it installed super fast and works perfect.
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That is the same experience I had.
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I think 1903 update on my 2011 HP Probook (6465b) installed around 8/19. I did not think that 1903 would work on the old thing. I will be watching for 1909 to see if it works.
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Good luck! 
I have installed on a few machines, desktop, laptop and VMs. No problems so far and quick to install.
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I was planning to wait much longer. But today I decided to test and just see on a spare extra Laptop that I just got it to Windows 10 that I plan to get rid of. It surprised me its barely nothing, its only takes a couple of minutes. It more just like a regular update. So I have updated all my machines to it, and all is fine.
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I installed it back when it was offered to Release Preview insiders. It’s been running very well.
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Updating now from 1809. Wizard is asking to remove VMware Workstation. This is not looking good.
Updating from 1809 would be like normal big feature update. From 1903 it is a small update.
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Updated from 1809. Like the icons, not the interface changes.
Re-installed VMware in the background, everything works again. 
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You’re right. It took at least an hour between starting the update and coming back from eating.
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The VMWare uninstall thing might be something to do with Windows Sandbox and wanting control of the hyper visor while it is Windows is being installed.
(Windows 10 Pro only I think)
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Makes sense, I have the Pro edition. I assumed based on the release notes it would be fixed by 1909 so I was unprepared.
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Well sometimes they make architectural changes that SHOULDN’T break correctly written software… but then some software in wide use is not correctly written. This was an issue for some anti-cheat software for example. (Where you can imagine why they might be less conforming than other software.) I could imagine that an old version of VMWare might be so affected and reinstalling a newer one would fix any known issue. Also, Microsoft has special routines for known problem software, known as a compatibility layer or something, and that usually is applied and activated during install.
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