From one of the Microsoft answers pages http://answers.microsoft.com/en-us/windows/forum/windows_10-windows_install/windows-update-installation-failure-80240020/d695e827-9774-4e10-8972-df8d51a7bb51
You need to make sure you are registered first, there will be 2 keys created in this registry folder about indicating you are registered and allowed for download - I used this method on 5 PCs including some that hadn't finished the download yet
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~If you are very eager to upgrade, tech savvy users with the above message can modify the following registry key to install immediately.
Warning: Serious problems might occur if you modify the registry incorrectly. Before you modify it, back up the registry for restoration in case problems occur.
1.Locate the registry key: [HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\WindowsUpdate\OSUpgrade]
2.It should exist, but if not, create it.
3.Create a new DWORD (32-bit) Value with Name = "AllowOSUpgrade? (without the quotes), and set the Value = 0x00000001.
Once the registry key is modified, close and reopen the desktop Control Panel, go to Windows Update and check for updates. You should now be able to click the Get Started button to upgrade to Windows 10. Note: Windows 8.1 users must go to the desktop Control Panel, and not the modern Windows Update UI.?
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You need to make sure you are registered first, there will be 2 keys created in this registry folder about indicating you are registered and allowed for download - I used this method on 5 PCs including some that hadn't finished the download yet
---
~If you are very eager to upgrade, tech savvy users with the above message can modify the following registry key to install immediately.
Warning: Serious problems might occur if you modify the registry incorrectly. Before you modify it, back up the registry for restoration in case problems occur.
1.Locate the registry key: [HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\WindowsUpdate\OSUpgrade]
2.It should exist, but if not, create it.
3.Create a new DWORD (32-bit) Value with Name = "AllowOSUpgrade? (without the quotes), and set the Value = 0x00000001.
Once the registry key is modified, close and reopen the desktop Control Panel, go to Windows Update and check for updates. You should now be able to click the Get Started button to upgrade to Windows 10. Note: Windows 8.1 users must go to the desktop Control Panel, and not the modern Windows Update UI.?
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