Cannot perform in-place upgrade from WS2012 / WS 2008R2 to WS 2012 R2

Cannot perform in-place upgrade from WS2012 / WS 2008R2 to WS 2012 R2

Issue:
Trying to upgrade from
Windows Server 2012 to Windows Server 2012 R2 The following occurs:
·         Copy install files to install directory on local system
·         Click Setup.exe.
·         UAC requires acceptance.
·         Windows Server 2012 R2 appears.
·         Click Install Now Button.
·         Message: "Setup is copying temporary files."
·         Message: "Setup is starting."
·         Splash screen reappears.
Cannot get beyond this to the wizard. Tried safe mode, tried from mounted ISO, tried from Install directory with setup files.
No indication of error in any Windows logs

Resolution

Environment: My 2012R2 ISO is mounted on D:, Windows system on C:.

Process: Open an Administrator command prompt and run the following command:

D:\Sources\setup.exe /HideWelcome /uilanguage:en-US /targetlanguage:en-US /runlocal

When prompted to check for updates, accept and continue. Setup will eventually fail but not before it has downloaded an updated setup.exe and supporting files to a handful of folders on C:. These updated files let me complete the installation

Run the same command again

C:\$WINDOWS.~BT\Sources\setup.exe /runlocal /BTFolderPath:C:\$WINDOWS.~BT /OSImagePath:"D:\Sources" /HideWelcome /uilanguage:en-US /targetlanguage:en-US

This time skip the updates and the install completed successfully