Installation fails badly when destination has incorrect permissions

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Installation fails under Mountain Lion with the following error message

The installation failed with the following error: Error Domain=NSCocoaErrorDomain Code=513 "“500px Aperture Uploader.ApertureExport” couldn’t be copied because you don’t have permission to access “Export”." UserInfo=0x7fe453892e40 {NSSourceFilePathErrorKey=/Users/User/Desktop/Install 500px Aperture Uploader.app/Contents/Resources/500px Aperture Uploader.ApertureExport, NSUserStringVariant=(
Copy
), NSDestinationFilePath=/Users/User/Library/Application Support/Aperture/Plug-Ins/Export/500px Aperture Uploader.ApertureExport, NSFilePath=/Users/User/Desktop/Install 500px Aperture Uploader.app/Contents/Resources/500px Aperture Uploader.ApertureExport, NSUnderlyingError=0x7fe4538935f0 "The operation couldn’t be completed. Permission denied"}

A temporary fix is to navigate to Users/User/Library/Application Support/Aperture/ and ensure user level permissions are set for the "Plug-ins" and "Export" folders.

Running the installer again afterwards works perfectly.