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(I say “forced” realizing that, at some point, the Windows 10 customer may have clicked a box that offered to “Reserve your free upgrade.” Few people would expect that a one-click reservation would start you down the path of an irreversible upgrade, eh?) At this point, we have one potentially problematic solution that doesn’t work on all machines.
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We’ve been running a series of tests over on the AskWoody site, seeing if there’s a way to thwart late-stage forced upgrade scenarios. GWX Control Panel does not work if Windows Update shows the “Your upgrade to Windows 10 is ready” message (screenshot), nor if you’re getting messages that say “It’s almost time for your upgrade,” allowing you to reschedule - but not cancel - the update. The latter option sets the registry key listed in KB 3080351 - you don’t have to manually change the registry, and it works whether or not you have the Group Policy Editor. To get rid of the “Upgrade to Windows 10” message, run GWX Control Panel, click the box to “Disable Get Windows 10 App,” then “Disable Operating System Upgrades in Windows Update.” The former option deletes and hides a cornucopia of Windows updates responsible for the festering mess. It will not start the upgrade to Windows 10. Based on tests with dozens of systems, Windows 7 or 8.1 will apply only the patches you select. Click the link that says "Show all available updates." Uncheck the box marked “Upgrade to Windows 10,” select (check) any updates you may want to apply, click OK, and click Install Updates. In fact, you can install any patches you like without installing Windows 10. If you go into Windows Update and get a screen that says “Upgrade to Windows 10” (screenshot), you may think you’re stuck - the only update you can install is the one that upgrades the system to Windows 10.
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You can safely treat Windows Update as you always have - which, in my case, means setting Windows Update to “Notify but don’t download,” and avoiding this month’s patches until we know more about them.
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If you go into Windows Update and see a normal update screen listing important and optional updates, you haven’t been fully infected by the Windows 10 upgrade shenanigans.
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