Get Orca.msi
http://www.technipages.com/downloads/OrcaMSI.zip
Open BootCamp.msi with Orca
Look for LaunchCondition and delete first 2 lines, "Privilege.. and Require Windows 7...", something like that.
Save it and you're good to go. (Don't launch Setup.exe, just open BootCamp.msi)
Confusion here ... I think Shirasaki asked for a direct BootCamp 6 for Windows download link, executable under Windows ( and using this utility ). No pkg file for OSX. Very helpful, though. Thank you !