Upgrade to Windows 10 Pro, version 1511, 10586 errors with 0x8024200D

Here is how I fixed this issue:

1. I booted into safe mode (using MSCONFIG).
2. I deleted the contents of C:\Windows\SoftwareDistribution\Download
3. I turned off safe mode and booted into windows normally.
4. I re-downloaded and attempted to install the update again.

The error code 0x8024200D means, that the files had to be downloaded again.

//
// MessageId: WU_E_UH_NEEDANOTHERDOWNLOAD
//
// MessageText:
//
// The update handler did not install the update because it needs to be downloaded again.
//
#define WU_E_UH_NEEDANOTHERDOWNLOAD      _HRESULT_TYPEDEF_(0x8024200DL)

So try it again, or download the Windows 10 Version 1511 ISO, mount the ISO, run setup.exe and upgrade to the new build.