Some Tips from Fat Bloke August 2, 2012,
Volume 174, Issue 1
Even though VirtualBox 4.1.18 is not yet commercially supported, for certain some users will want to run it with Mountain Lion (Mac OS X 10.8). The installation is not altogether straightforward but Fat Bloke provides some tips for getting things to work. First of all, don't expect clicking on the VirtualBox.mpkg icon to work. It won't, unless you alter the default security settings to check "Anywhere" as a source for downloads (remembering, of course, to recheck the default settings when you're finished). You can also hold down the Control key and click the .mpkg and chose "Open" for a similar result. All of this opens the Mountain Lion door to VirtualBox. Fat Bloke promises a fully supported version of VirtualBox 4.1.18 in the near future.