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Would I then have to run setup as per normal OS install again?
Correct. Download ISO, mount it as optical drive (double click), then run setup from the virtual drive. It will update your OS to the initial 1803 version. However it is not the most recent version, just an initial 1803 release. After OS is updated to 1803, it will force all current updates, which can consume a large amount of data (as much as 1.5GB) if you are lucky. If you are unlucky it will download updates, installator will crash during installing updates, all updates will be deleted, then the entire process will resume after couple hours.You can download build 1803 as an ISO.
https://www.windowsvibes.com/387/windows-10-version-1803-download/
If there is another Win10 machine on the network, your operating system is able to retrieve updates from that machine.
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AutoPatcher
Developer(s) Antonis Kaladis & Jason Kelley & TheAPGuyInitial release October 15, 2003; 14 years agoStable release
6.2.22 (AutoPatcher)
1.4.43 (APUP) / April 22, 2017; 16 months ago
Operating system XP, Vista, 7, 8, and 10Platform Microsoft WindowsAvailable in English (Other translations available)Type Software utilityLicense FreewareWebsite www.autopatcher.net
AutoPatcher is an offline updater and alternative to Microsoft Update that can be used for installing software patches, service packs and other updates for certain Microsoft Windows systems. It allows these to be downloaded on a different machine or in advance, and then installed without an internet connection. By doing this, system updates can be automated and scripted, time and bandwidth required to download relevant updates is reduced, and exposure of unsecured systems online can be avoided. AutoPatcher also allows installation of some common additional software, registry settings, and patches for other Microsoft software, notably Microsoft Office.[1]
AutoPatcher currently exists for Windows 2000, XP, Vista, 7, 8, 10 and some server equivalents (Windows 2003 and 2008)

Well, if one can update at least 1 of the computers to the newest updates, and then set the other computers to update from other computers on the LAN, they will pull updates from the other more up to date PCs till all are on the newest, theoretically.
It won't work, as Windows used to ignore this settings and chose to download from MS servers anyway.Well, if one can update at least 1 of the computers to the newest updates, and then set the other computers to update from other computers on the LAN, they will pull updates from the other more up to date PCs till all are on the newest, theoretically.
It is exactly what you want. Initially it will take some time to download all the updates but there after it just running the updater and getting the latest updates added.Thanks, @Dairyfarmer will have a look & see if works.
Update one, the rest will update over the LAN from that one.No, not what I'm after.
10 Pc's with different versions from Home to Pro.
It won't work, see my previous post.Update one, the rest will update over the LAN from that one.
It won't work, see my previous post.
It is exactly what you want. Initially it will take some time to download all the updates but there after it just running the updater and getting the latest updates added.
It is the perfect tool if you are rebuilding computers or have a bunch you need to update.
These are dirty tricks, you don't need do that?You literally said it won’t work and that you gave up on Windows 10 in the same post.
So which is it?
I’ve seen it work quite happily.