installer: The upgrade failed (The Installer encountered an error that caused the installation to fail. Contact the software manufacturer for assistance.)

[Rafal]

When installing VirtualBox on Mac, there is an error.

#
installer: Moving items into place….....
#installer[1982]: PackageKit: Executing script "./postflight" in /Volumes/VirtualBox/VirtualBox.mpkg/Contents/Packages/VBoxKEXTs.pkg/Contents/Resources
installer[1982]: ./postflight: (kernel) Kext org.virtualbox.kext.VBoxNetFlt did not stop (return code 0x5).
installer[1982]: ./postflight: (kernel) Kext org.virtualbox.kext.VBoxNetFlt can't unload - module stop returned 0xdc008017.
installer[1982]: ./postflight: Failed to unload org.virtualbox.kext.VBoxNetFlt - (libkern/kext) kext (kmod) start/stop routine failed.
installer[1982]: ./postflight: Failed to unload org.virtualbox.kext.VBoxDrv - (libkern/kext) kext is in use or retained (cannot unload).

installer: Running package scripts….....
#installer[1982]: ./postflight: /Library/Extensions/VBoxDrv.kext failed to load - (libkern/kext) different version/uuid already loaded; check the system/kernel logs for errors or try kextutil(8).
installer[1982]: ./postflight: /Library/Extensions/VBoxUSB.kext failed to load - (libkern/kext) dependency resolution failure; check the system/kernel logs for errors or try kextutil(8).
installer[1982]: ./postflight: /Library/Extensions/VBoxNetFlt.kext failed to load - (libkern/kext) different version/uuid already loaded; check the system/kernel logs for errors or try kextutil(8).
installer[1982]: ./postflight: /Library/Extensions/VBoxNetAdp.kext failed to load - (libkern/kext) dependency resolution failure; check the system/kernel logs for errors or try kextutil(8).
installer[1982]: PackageKit: Install Failed: PKG: post-flight scripts for "org.virtualbox.pkg.vboxkexts"
Error Domain=PKInstallErrorDomain Code=112 UserInfo=0x1004a82f0 "An error occurred while running scripts from the package “VBoxKEXTs.pkg”." {
    NSFilePath = "./postflight";
    NSLocalizedDescription = "An error occurred while running scripts from the package \U201cVBoxKEXTs.pkg\U201d.";
    NSURL = "./Contents/Packages/VBoxKEXTs.pkg -- file://localhost/Volumes/VirtualBox/VirtualBox.mpkg/";
    PKInstallPackageIdentifier = "org.virtualbox.pkg.vboxkexts";
}
installer[1982]: install:didFailWithError:Error Domain=PKInstallErrorDomain Code=112 UserInfo=0x1004a82f0 "An error occurred while running scripts from the package “VBoxKEXTs.pkg”."
#installer[1982]: Install failed: The Installer encountered an error that caused the installation to fail. Contact the software manufacturer for assistance.

installer: The upgrade failed (The Installer encountered an error that caused the installation to fail. Contact the software manufacturer for assistance.)

[Rafal]

See the log file for details.

[aeichner]

Please reopen if still relevant with a recent VirtualBox release.