virtualbox.org

It seems like I should be able to create an account and post a link to a post that describes my issue, but it won't let me. The ID for the topic that describes my problem is viewtopic.php?f=8&t=85728. [ModEdit: added link]

Per the instructions there, I uninstalled, rebooted my machine and installed with logging. I'm attaching a zipped file of the log output.

I get a message that the installation was unsuccessful when I run the install package I downloaded from your site.

Thanks in advance for any advice.

JJun 22 11:10:59 DC2AAHTDF-M installd[1460]: ./postflight: /Library/Application Support/
    VirtualBox/VBoxDrv.kext failed to load - (libkern/kext) system policy prevents loading;
    check the system/kernel logs for errors or try kextutil(8).

See the Apple Documentation: User-Approved Kernel Extension Loading.
The fact that you are NOT seeing the warning dialog remains a mystery, even for Apple...