FYI, if you are having trouble installing Windows 10 (repeated failures), try the following.
1. Locate the registry key [HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\Curr entVersion\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.
https://answers.microsoft.com/en-us/...1a7bb51?auth=1