Tried to install both the 32-bit and 64-bit versions. Both failed to install (but 32-bit version got further).
64-bit version is available here; http://support.apple.com/kb/DL1615
64-bit crashed immediately (not a big surprise).
32-bit ran the installer but there was a large "jump" where it skipped installing the main application went straight to installing the supporting files.
Apple software update successfully installed and runs, sadly though iTunes is missing.