Installer asks for authorization, but fails with Cannot get authorization afterwards

The latest mingw installer asks me for administrative permissions, but fails with 'Couldn't get authorization' afterwards.

Operations start: 158079
Operations end: 16
Resource count: 1
Data block size: 685653643
Magic marker: 302133811
Magic cookie: 14007050384008702200
Index size: 48
End of data: 698072715
Number of operations: 0
Number of components loaded: 22
qt loaded...
qt.tools.win32_mingw48 loaded...

• 2 archives: 4.8.0-1-1x32-4.8.0-release-posix-dwarf-rev2.7z - 38.26 MiB; 4.8.0-1-1x32-4.8.0-release-posix-dwarf-rev2.7z.sha1 - 40.00 bytes
  qt.tools.vcredist loaded...
• 2 archives: 2011-03-03vcredist_sp1_x86.7z - 4.80 MiB; 2011-03-03vcredist_sp1_x86.7z.sha1 - 40.00 bytes
  qt.510.win32_mingw48.essentials loaded...
• 6 archives: 5.1.0icu_51_1_mingw_builds_4_8_0_posix_dwarf_32.7z - 6.26 MiB; 5.1.0icu_51_1_mingw_builds_4_8_0_posix_dwarf_32.7z.sha1 - 40.00 bytes; 5.1.0mingw48_essentials.7z - 366.36 MiB; 5.1.0mingw48_essentials.7z.sha1 - 40.
  00 bytes; 5.1.0x32-4.8.0-release-posix-dwarf-rev2-runtime.7z - 353.11 KiB; 5.1.0x32-4.8.0-release-posix-dwarf-rev2-runtime.7z.sha1 - 40.00 bytes
  qt.510.win32_mingw48.addons loaded...
• 2 archives: 5.1.0mingw48_addons.7z - 11.09 MiB; 5.1.0mingw48_addons.7z.sha1 - 40.00 bytes
  qt.510.src loaded...
  qt.510.src.addons.qtserialport loaded...
• 2 archives: 5.1.0qtserialport-src.7z - 175.92 KiB; 5.1.0qtserialport-src.7z.sha1 - 40.00 bytes
  qt.510.win32_mingw48 loaded...
  qt.tools.qtcreator loaded...
• 4 archives: 2.7.0D3DCompiler_43-x86.7z - 688.05 KiB; 2.7.0D3DCompiler_43-x86.7z.sha1 - 40.00 bytes; 2.7.0qt-creator-opensource-vs2010-32.7z - 53.55 MiB; 2.7.0qt-creator-opensource-vs2010-32.7z.sha1 - 40.00 bytes
  qt.510 loaded...
  qt.tools loaded...
  qt.510.src.essentials loaded...
• 24 archives: 5.1.0qtbase-src.7z - 44.72 MiB; 5.1.0qtbase-src.7z.sha1 - 40.00 bytes; 5.1.0qtdeclarative-src.7z - 15.82 MiB; 5.1.0qtdeclarative-src.7z.sha1 - 40.00 bytes; 5.1.0qtdoc-src.7z - 16.00 MiB; 5.1.0qtdoc-src.7z.sha1 -
  40.00 bytes; 5.1.0qtjsbackend-src.7z - 8.04 MiB; 5.1.0qtjsbackend-src.7z.sha1 - 40.00 bytes; 5.1.0qtmultimedia-src.7z - 4.01 MiB; 5.1.0qtmultimedia-src.7z.sha1 - 40.00 bytes; 5.1.0qtquick1-src.7z - 15.23 MiB; 5.1.0qtquick1-src.7
  z.sha1 - 40.00 bytes; 5.1.0qtquickcontrols-src.7z - 533.66 KiB; 5.1.0qtquickcontrols-src.7z.sha1 - 40.00 bytes; 5.1.0qtscript-src.7z - 2.53 MiB; 5.1.0qtscript-src.7z.sha1 - 40.00 bytes; 5.1.0qttools-src.7z - 8.85 MiB; 5.1.0qttool
  s-src.7z.sha1 - 40.00 bytes; 5.1.0qtwebkit-examples-src.7z - 3.24 MiB; 5.1.0qtwebkit-examples-src.7z.sha1 - 40.00 bytes; 5.1.0qtwebkit-src.7z - 32.41 MiB; 5.1.0qtwebkit-src.7z.sha1 - 40.00 bytes; 5.1.0qtxmlpatterns-src.7z - 1.31
  MiB; 5.1.0qtxmlpatterns-src.7z.sha1 - 40.00 bytes
  qt.510.patcher loaded...
  qt.510.src.addons.qtsvg loaded...
• 2 archives: 5.1.0qtsvg-src.7z - 1.67 MiB; 5.1.0qtsvg-src.7z.sha1 - 40.00 bytes
  qt.readme loaded...
• 4 archives: 1.0.0qt-project-url.7z - 230.00 bytes; 1.0.0qt-project-url.7z.sha1 - 40.00 bytes; 1.0.0readme.7z - 2.22 KiB; 1.0.0readme.7z.sha1 - 40.00 bytes
  qt.510.src.addons.qtx11extras loaded...
• 2 archives: 5.1.0qtx11extras-src.7z - 28.71 KiB; 5.1.0qtx11extras-src.7z.sha1 - 40.00 bytes
  qt.510.src.addons.qtgraphicaleffects loaded...
• 2 archives: 5.1.0qtgraphicaleffects-src.7z - 13.65 MiB; 5.1.0qtgraphicaleffects-src.7z.sha1 - 40.00 bytes
  qt.510.src.addons.qttranslations loaded...
• 2 archives: 5.1.0qttranslations-src.7z - 1019.16 KiB; 5.1.0qttranslations-src.7z.sha1 - 40.00 bytes
  qt.510.src.addons.qtimageformats loaded...
• 2 archives: 5.1.0qtimageformats-src.7z - 1004.53 KiB; 5.1.0qtimageformats-src.7z.sha1 - 40.00 bytes
  qt.510.src.addons.qtsensors loaded...
• 2 archives: 5.1.0qtsensors-src.7z - 1.98 MiB; 5.1.0qtsensors-src.7z.sha1 - 40.00 bytes
  qt.510.src.addons.qtactiveqt loaded...
• 2 archives: 5.1.0qtactiveqt-src.7z - 257.46 KiB; 5.1.0qtactiveqt-src.7z.sha1 - 40.00 bytes
  qt.510.src.addons loaded...
  Resource tree after loading the in-binary resource:
  :/files-to-patch-linux
  :/files-to-patch-linux-emb-arm
  :/files-to-patch-linux-qt5
  :/files-to-patch-macx
  :/files-to-patch-macx-qt5
  :/files-to-patch-windows
  :/files-to-patch-windows-emb-arm
  :/files-to-patch-windows-qt5
  :/installer.icns
  :/installer.ico
  :/installer.png
  :/metadata
  :/translations
  :/trolltech
  :/metadata/config
  :/metadata/installer-config
  :/metadata/qt
  :/metadata/qt.510.patcher
  :/metadata/qt.510.src.addons.qtactiveqt
  :/metadata/qt.510.src.addons.qtgraphicaleffects
  :/metadata/qt.510.src.addons.qtimageformats
  :/metadata/qt.510.src.addons.qtsensors
  :/metadata/qt.510.src.addons.qtserialport
  :/metadata/qt.510.src.addons.qtsvg
  :/metadata/qt.510.src.addons.qttranslations
  :/metadata/qt.510.src.addons.qtx11extras
  :/metadata/qt.510.src.essentials
  :/metadata/qt.510.win32_mingw48.addons
  :/metadata/qt.510.win32_mingw48.essentials
  :/metadata/qt.readme
  :/metadata/qt.tools.qtcreator
  :/metadata/qt.tools.vcredist
  :/metadata/qt.tools.win32_mingw48
  :/metadata/rccprojectUh4108.qrc
  :/metadata/Updates.xml
  StartMenuPath: "C:\Users\kkoehne\AppData\Roaming\Microsoft\Windows\Start Menu\Programs"
  DesktopDir: "C:\Users\kkoehne\Desktop"
  Unable to open translated license file. Using untranslated fallback.
  Unable to open translated license file. Using untranslated fallback.
  Unable to open translated license file. Using untranslated fallback.
  Unable to open translated license file. Using untranslated fallback.
  Unable to open translated license file. Using untranslated fallback.
  Url is: "://metadata/"
  Warning: Designer: Attempt to add child that is not of class QWizardPage to QWizard.
  Warning: Designer: Attempt to add child that is not of class QWizardPage to QWizard.
  Warning: Designer: Attempt to add child that is not of class QWizardPage to QWizard.
  qt.510.win32_mingw48.addons added
  qt.510.win32_mingw48.essentials added
  qt.510.win32_mingw48.addons added
  qt.510.win32_mingw48.essentials added
  qt.510.win32_mingw48.addons added
  qt.510.win32_mingw48.essentials added
  qt.510.win32_mingw48.addons added
  qt.510.win32_mingw48.essentials added
  components list is empty in bool __thiscall QInstaller::PackageManagerCorePrivate::appendComponentsToUninstall(const class QList<class QInstaller::Component *> &)
  qt.510.win32_mingw48.addons added
  qt.510.win32_mingw48.essentials added
  Tmp and install folder are on the same volume. Volume mount point: "C:\" Free space available: "54.48 GiB"
  Installation space required: "0.00 bytes" Temporary space required: "0.00 bytes" Local repository size: "0.00 bytes"
  backup operation: Mkdir
• arguments: C:/Qt/Qt5.1.0-mingw-opensource
  Done
  perform operation: Mkdir
• arguments: C:/Qt/Qt5.1.0-mingw-opensource
  Done
  Install size: 11 components
  Starting elevated process C:\Users\kkoehne\Downloads\qt-windows-opensource-5.1.0-rc1-mingw48_opengl-x86-offline-2013-05-31-45.exe with arguments: --startserver 30220 {682f81eb-365a-4b92-bb16-fcfa2327c81a}.
  Finished starting elevated process.
  created critical message box Authorization Error: 'Couldn't get authorization.', Couldn't get authorization that is needed for continuing the installation.
  Either abort the installation or use the fallback solution by running
  C:/Users/kkoehne/Downloads/qt-windows-opensource-5.1.0-rc1-mingw48_opengl-x86-offline-2013-05-31-45.exe --startserver 30220 {682f81eb-365a-4b92-bb16-fcfa2327c81a}

  as root and then clicking ok.