pour pouvoir mettre à jour votre build insider si vous aviez fait "machine arrière"

If you previously had a new Windows 10 preview build installed in your computer and then you reverted back to an older build, you'll lose access to the new build and it'll no longer be offered as an upgrade option. If you want to install that build again, deleting that build number from the list at HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\WindowsSelfHost\Applicability\RecoveredFrom key in Registry Editor will restore the ability to upgrade. Thanks to our reader "thedicemaster" for this info...