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Unable to install Malwarebytes with Malwarebytes-Mac-3.1.1.505.pkg on MacBook Pro 13-inch 2016 running macOS Sierra v. 10.12.5.

I've tried under two different user accounts, one a new admin user to test the installation.

The installation fails with this error:

"The Installation Failed

The installer encountered an error that caused the

installation to fail. Contact the software manufacturer

for assistance."

Here is the relevant entry from /var/log/install.log

Jan 24 10:49:36 Zellas-MBP Installer[4424]: @(#)PROGRAM:Install  PROJECT:Install-1000
Jan 24 10:49:36 Zellas-MBP Installer[4424]: @(#)PROGRAM:Installer  PROJECT:Installer-909
Jan 24 10:49:36 Zellas-MBP Installer[4424]: Hardware: MacBookPro13,1 @ 2.00 GHz (x 4), 16384 MB RAM
Jan 24 10:49:36 Zellas-MBP Installer[4424]: Running OS Build: Mac OS X 10.12.5 (16F73)
Jan 24 10:49:36 Zellas-MBP Installer[4424]: Env: __CF_USER_TEXT_ENCODING=0x1F5:0x0:0x0
Jan 24 10:49:36 Zellas-MBP Installer[4424]: Env: TMPDIR=/var/folders/57/qnv2gyws5q11fj9xbm3bfz9c0000gn/T/
Jan 24 10:49:36 Zellas-MBP Installer[4424]: Env: HOME=/Users/test
Jan 24 10:49:36 Zellas-MBP Installer[4424]: Env: SHELL=/bin/bash
Jan 24 10:49:36 Zellas-MBP Installer[4424]: Env: SSH_AUTH_SOCK=/private/tmp/com.apple.launchd.TX8tLBWzGd/Listeners
Jan 24 10:49:36 Zellas-MBP Installer[4424]: Env: Apple_PubSub_Socket_Render=/private/tmp/com.apple.launchd.qkglvHTBmQ/Render
Jan 24 10:49:36 Zellas-MBP Installer[4424]: Env: PATH=/usr/bin:/bin:/usr/sbin:/sbin
Jan 24 10:49:36 Zellas-MBP Installer[4424]: Env: LOGNAME=test
Jan 24 10:49:36 Zellas-MBP Installer[4424]: Env: XPC_SERVICE_NAME=com.apple.xpc.launchd.oneshot.0x1000001d.Installer
Jan 24 10:49:36 Zellas-MBP Installer[4424]: Env: COMMAND_MODE=unix2003
Jan 24 10:49:36 Zellas-MBP Installer[4424]: Env: USER=test
Jan 24 10:49:36 Zellas-MBP Installer[4424]: Env: XPC_FLAGS=0x0
Jan 24 10:49:36 Zellas-MBP Installer[4424]: Malwarebytes for Mac  Installation Log
Jan 24 10:49:36 Zellas-MBP Installer[4424]: Opened from: /Users/test/Downloads/Malwarebytes-Mac-3.1.1.505.pkg
Jan 24 10:49:36 Zellas-MBP Installer[4424]: Product archive /Users/test/Downloads/Malwarebytes-Mac-3.1.1.505.pkg trustLevel=202
Jan 24 10:49:38 Zellas-MBP Installer[4424]: Kext checker pane should not be loaded
Jan 24 10:49:38 Zellas-MBP Installer[4424]: Kext checker pane should be loaded
Jan 24 10:49:38 Zellas-MBP Installer[4424]: JS: Target macOS '10.12.5'.
Jan 24 10:49:43 Zellas-MBP Installer[4424]: InstallerStatusNotifications plugin loaded
Jan 24 10:49:52 Zellas-MBP Installer[4424]: Administrator authorization granted.
Jan 24 10:49:52 Zellas-MBP Installer[4424]: ================================================================================
Jan 24 10:49:52 Zellas-MBP Installer[4424]: User picked Standard Install
Jan 24 10:49:52 Zellas-MBP Installer[4424]: Choices selected for installation:
Jan 24 10:49:52 Zellas-MBP Installer[4424]:     Install: "Malwarebytes for Mac"
Jan 24 10:49:52 Zellas-MBP Installer[4424]:     Install: "Malwarebytes 3.1 for Mac"
Jan 24 10:49:52 Zellas-MBP Installer[4424]:         Malwarebytes-Mac-3.1.1.505.pkg#MBAM.pkg : com.malwarebytes.mbam : 1.0
Jan 24 10:49:52 Zellas-MBP Installer[4424]: ================================================================================
Jan 24 10:49:52 Zellas-MBP Installer[4424]: It took 0.00 seconds to summarize the package selections.
Jan 24 10:49:52 Zellas-MBP Installer[4424]: -[IFDInstallController(Private) _buildInstallPlanReturningError:]: location = file://localhost
Jan 24 10:49:52 Zellas-MBP Installer[4424]: -[IFDInstallController(Private) _buildInstallPlanReturningError:]: file://localhost/Users/test/Downloads/Malwarebytes-Mac-3.1.1.505.pkg#MBAM.pkg
Jan 24 10:49:52 Zellas-MBP Installer[4424]: Set authorization level to root for session
Jan 24 10:49:52 Zellas-MBP Installer[4424]: Will use PK session
Jan 24 10:49:52 Zellas-MBP Installer[4424]: Using authorization level of root for IFPKInstallElement
Jan 24 10:49:52 Zellas-MBP Installer[4424]: Starting installation:
Jan 24 10:49:52 Zellas-MBP Installer[4424]: Configuring volume "Macintosh HD"
Jan 24 10:49:52 Zellas-MBP Installer[4424]: Preparing disk for local booted install.
Jan 24 10:49:52 Zellas-MBP Installer[4424]: Free space on "Macintosh HD": 150.39 GB (150390542336 bytes).
Jan 24 10:49:52 Zellas-MBP Installer[4424]: Create temporary directory "/var/folders/57/qnv2gyws5q11fj9xbm3bfz9c0000gn/T//Install.4424nnCpb2"
Jan 24 10:49:52 Zellas-MBP Installer[4424]: IFPKInstallElement (1 packages)
Jan 24 10:49:52 Zellas-MBP installd[276]: PackageKit: Adding client PKInstallDaemonClient pid=4424, uid=501 (/System/Library/CoreServices/Installer.app/Contents/MacOS/Installer)
Jan 24 10:49:52 Zellas-MBP Installer[4424]: PackageKit: Enqueuing install with framework-specified quality of service (utility)
Jan 24 10:49:52 Zellas-MBP installd[276]: PackageKit: ----- Begin install -----
Jan 24 10:49:52 Zellas-MBP installd[276]: PackageKit: request=PKInstallRequest <1 packages, destination=/>
Jan 24 10:49:52 Zellas-MBP installd[276]: PackageKit: packages=(
        "PKLeopardPackage <file://localhost/Users/test/Downloads/Malwarebytes-Mac-3.1.1.505.pkg#MBAM.pkg>"
    )
Jan 24 10:49:52 Zellas-MBP installd[276]: PackageKit: Session UUID file exists - will not overwrite /var/folders/zz/zyxvpxvq6csfxvn_n0000000000000/C/PKInstallSandboxManager/B1173C6B-621F-481A-A155-BBC3C4BB0727.activeSandbox
Jan 24 10:49:52 Zellas-MBP installd[276]: PackageKit: Extracting file://localhost/Users/test/Downloads/Malwarebytes-Mac-3.1.1.505.pkg#MBAM.pkg (destination=/var/folders/zz/zyxvpxvq6csfxvn_n0000000000000/C/PKInstallSandboxManager/B1173C6B-621F-481A-A155-BBC3C4BB0727.activeSandbox/Root, uid=0)
Jan 24 10:49:53 Zellas-MBP installd[276]: PackageKit: prevent user idle system sleep
Jan 24 10:49:53 Zellas-MBP installd[276]: PackageKit: suspending backupd
Jan 24 10:49:53 Zellas-MBP installd[276]: PackageKit: Executing script "./preinstall" in /private/tmp/PKInstallSandbox.Kq4FXb/Scripts/com.malwarebytes.mbam.5879bn
Jan 24 10:49:53 Zellas-MBP installd[276]: ./preinstall: Killing main application if it's running
Jan 24 10:49:53 Zellas-MBP install_monitor[4435]: Temporarily excluding: /Applications, /Library, /System, /bin, /private, /sbin, /usr
Jan 24 10:49:53 Zellas-MBP installd[276]: ./preinstall: No matching processes were found
Jan 24 10:49:53 --- last message repeated 1 time ---
Jan 24 10:49:53 Zellas-MBP installd[276]: ./preinstall: Agent unload for All active users from /Library/LaunchAgents/com.malwarebytes.mbam.frontend.agent.plist...
Jan 24 10:49:53 Zellas-MBP installd[276]: ./preinstall:   Using new launchctl interface:
Jan 24 10:49:53 Zellas-MBP installd[276]: ./preinstall:     UID: 501
Jan 24 10:49:53 Zellas-MBP installd[276]: ./preinstall: /Library/LaunchAgents/com.malwarebytes.mbam.frontend.agent.plist: Could not find specified service
Jan 24 10:49:53 Zellas-MBP installd[276]: ./preinstall: Agent unloading has been finished
Jan 24 10:49:53 Zellas-MBP installd[276]: ./preinstall: RTP Daemon is not running
Jan 24 10:49:53 Zellas-MBP installd[276]: ./preinstall: kextstat result: 
Jan 24 10:49:53 Zellas-MBP installd[276]: ./preinstall: FS driver is not loaded
Jan 24 10:49:53 Zellas-MBP installd[276]: ./preinstall: SK Daemon is not loaded
Jan 24 10:49:53 Zellas-MBP installd[276]: ./preinstall: Removing files
Jan 24 10:49:53 Zellas-MBP installd[276]: PackageKit: Using trashcan path /var/folders/zz/zyxvpxvq6csfxvn_n0000000000000/T/PKInstallSandboxTrash/B1173C6B-621F-481A-A155-BBC3C4BB0727.sandboxTrash for sandbox /var/folders/zz/zyxvpxvq6csfxvn_n0000000000000/C/PKInstallSandboxManager/B1173C6B-621F-481A-A155-BBC3C4BB0727.activeSandbox
Jan 24 10:49:53 Zellas-MBP installd[276]: PackageKit: Shoving /var/folders/zz/zyxvpxvq6csfxvn_n0000000000000/C/PKInstallSandboxManager/B1173C6B-621F-481A-A155-BBC3C4BB0727.activeSandbox/Root (2 items) to /
Jan 24 10:49:53 Zellas-MBP installd[276]: PackageKit: kextcache -system-caches
Jan 24 10:49:54 Zellas-MBP installd[276]: PackageKit: kextcache -update-volume / -Installer
Jan 24 10:49:54 Zellas-MBP installd[276]: kextcache: Failed to read file.
Jan 24 10:49:54 Zellas-MBP installd[276]: kextcache: Failed to read kernel file.
Jan 24 10:49:54 Zellas-MBP installd[276]: kextcache: Child process /usr/sbin/kextcache[4486] exited with status 71.
Jan 24 10:49:54 Zellas-MBP installd[276]: kextcache: Error 107 rebuilding /System/Library/PrelinkedKernels/prelinkedkernel
Jan 24 10:49:54 Zellas-MBP install_monitor[4435]: Re-included: /Applications, /Library, /System, /bin, /private, /sbin, /usr
Jan 24 10:49:55 Zellas-MBP installd[276]: PackageKit: releasing backupd
Jan 24 10:49:55 Zellas-MBP installd[276]: PackageKit: allow user idle system sleep
Jan 24 10:49:55 Zellas-MBP installd[276]: PackageKit: Install Failed: Error Domain=PKInstallErrorDomain Code=121 "An error occurred while updating system extension information." UserInfo={NSUnderlyingError=0x7fa6996379e0 {Error Domain=kextcache Code=71 "(null)"}, NSLocalizedDescription=An error occurred while updating system extension information., arguments=(
        "-update-volume",
        "/",
        "-Installer"
    )} {
        NSLocalizedDescription = "An error occurred while updating system extension information.";
        NSUnderlyingError = "Error Domain=kextcache Code=71 \"(null)\"";
        arguments =     (
            "-update-volume",
            "/",
            "-Installer"
        );
    }
Jan 24 10:49:55 Zellas-MBP installd[276]: PackageKit: Running idle tasks
Jan 24 10:49:55 Zellas-MBP Installer[4424]: install:didFailWithError:Error Domain=PKInstallErrorDomain Code=121 "An error occurred while updating system extension information." UserInfo={arguments=(
        "-update-volume",
        "/",
        "-Installer"
    ), NSLocalizedDescription=An error occurred while updating system extension information., NSUnderlyingError=0x60800024d1a0 {Error Domain=kextcache Code=71 "(null)"}}
Jan 24 10:49:55 Zellas-MBP installd[276]: PackageKit: Removing client PKInstallDaemonClient pid=4424, uid=501 (/System/Library/CoreServices/Installer.app/Contents/MacOS/Installer)
Jan 24 10:49:55 Zellas-MBP installd[276]: PackageKit: Done with sandbox removals
Jan 24 10:49:55 Zellas-MBP Installer[4424]: Install failed: The Installer encountered an error that caused the installation to fail. Contact the software manufacturer for assistance.
Jan 24 10:49:55 Zellas-MBP Installer[4424]: IFDInstallController 2046E0 state = 8
Jan 24 10:49:55 Zellas-MBP Installer[4424]: Displaying 'Install Failed' UI.
Jan 24 10:49:55 Zellas-MBP Installer[4424]: 'Install Failed' UI displayed message:'The Installer encountered an error that caused the installation to fail. Contact the software manufacturer for assistance.'.
 

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It looks like you have a problem with the kext cache on your system. Try restarting the computer and see if that fixes the problem.

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