Q: restart not working to perform update to 10.11.6?

I'm having the same problem. Mine refuses to restart or shut down because the system says Finder is still open, even though it doesn't appear to be. I have run killall on Finder and it says nothing is running. Also tried force quit and relaunch. Nothing works! Have had to turn my macbook off at the power button for the past few days, but it returns in the same state when I turn it back on again.

Try installing while booted into the Safe Mode.

Safe Mode - About El Capitan

Safe Mode Startup – El Capitan.

I am also having this issue, I haven't been able to restart or shut down my laptop since the last system update.

Try the suggestion by Eric Root. If that doesn't work, please make an Etrecheck report and post the results in a reply: http://etrecheck.com/

EtreCheck version: 3.0 (300)

Report generated 2016-08-12 06:35:25

Download EtreCheck from https://etrecheck.com

Runtime 2:23

Performance: Excellent

Click the [Support] links for help with non-Apple products.

Click the [Details] links for more information about that line.

Click the [Remove] links to remove adware.

Problem: Other problem

Description:

Will not update OS X 10.11.6

Hardware Information: ⓘ

    MacBook Air (13-inch, Mid 2011)

    [Technical Specifications] - [User Guide] - [Warranty & Service]

    MacBook Air - model: MacBookAir4,2

    1 1.8 GHz Intel Core i7 CPU: 2-core

    4 GB RAM Not upgradeable

        BANK 0/DIMM0

            2 GB DDR3 1333 MHz ok

        BANK 1/DIMM0

            2 GB DDR3 1333 MHz ok

    Bluetooth: Old - Handoff/Airdrop2 not supported

    Wireless:  en0: 802.11 a/b/g/n

    Battery: Health = Normal - Cycle count = 714

Video Information: ⓘ

    Intel HD Graphics 3000

        Color LCD 1440 x 900

System Software: ⓘ

    OS X El Capitan 10.11.5 (15F34) - Time since boot: less than an hour

Disk Information: ⓘ

    APPLE SSD TS256C disk0 : (251 GB) (Solid State - TRIM: Yes)

        EFI (disk0s1) <not mounted> : 210 MB

        Recovery HD (disk0s3) <not mounted>  [Recovery]: 650 MB

        Macintosh HD (disk1) / : 249.80 GB (103.95 GB free)

            Encrypted AES-XTS Unlocked

            Core Storage: disk0s2 250.14 GB Online

USB Information: ⓘ

    Apple Card Reader

    Apple Inc. FaceTime Camera (Built-in)

    Apple Inc. Apple Internal Keyboard / Trackpad

    Apple Inc. BRCM20702 Hub

        Apple Inc. Bluetooth USB Host Controller

Thunderbolt Information: ⓘ

    Apple Inc. thunderbolt_bus

Configuration files: ⓘ

    /etc/hosts - Count: 19

Gatekeeper: ⓘ

    Mac App Store and identified developers

Adware: ⓘ

    ~/Library/LaunchAgents/com.jdibackup.ZipCloud.autostart.plist

    ~/Library/LaunchAgents/com.jdibackup.ZipCloud.notify.plist

    2 adware files found. [Remove]

System Launch Agents: ⓘ

    [not loaded]    8 Apple tasks

    [loaded]    162 Apple tasks

    [running]    68 Apple tasks

System Launch Daemons: ⓘ

    [not loaded]    47 Apple tasks

    [loaded]    161 Apple tasks

    [running]    83 Apple tasks

Launch Agents: ⓘ

    [not loaded]    com.adobe.AAM.Updater-1.0.plist (2016-06-29) [Support]

    [not loaded]    com.oracle.java.Java-Updater.plist

Launch Daemons: ⓘ

    [loaded]    com.adobe.SwitchBoard.plist (2013-06-10)

    [loaded]    com.adobe.agsservice.plist (2016-01-01) [Support]

    [loaded]    com.adobe.fpsaud.plist (2016-06-28)

    [running]    com.jungledisk.workgroupservice.plist (2013-06-10)

    [loaded]    com.microsoft.office.licensing.helper.plist (2010-08-25)

    [not loaded]    com.oracle.java.Helper-Tool.plist

User Launch Agents: ⓘ

    [loaded]    com.adobe.AAM.Updater-1.0.plist (2013-08-31) [Support]

    [loaded]    com.adobe.ARM.[...].plist (2013-06-10)

    [loaded]    com.google.keystone.agent.plist (2016-07-12)

    [failed]    com.jdibackup.ZipCloud.autostart.plist (2016-02-24) Adware!  [Remove]

        /usr/bin/open

    [loaded]    com.jdibackup.ZipCloud.notify.plist (2016-02-24) Adware!  [Remove]

        /usr/bin/open

User Login Items: ⓘ

    iTunesHelper    Application Hidden (/Applications/iTunes.app/Contents/MacOS/iTunesHelper.app)

    Jungle Disk Workgroup    Application Hidden (/Applications/Jungle Disk Workgroup.app)

    Dropbox    Application  (/Applications/Dropbox.app)

Internet Plug-ins: ⓘ

    DirectorShockwave: 12.0.9r149 - SDK 10.6 (2014-01-28) [Support]

    Default Browser: 601 - SDK 10.11 (2016-05-23)

    AdobeExManDetect: AdobeExManDetect 1.1.0.0 - SDK 10.7 (2014-09-21) [Support]

    AdobeAAMDetect: AdobeAAMDetect 1.0.0.0 - SDK 10.6 (2016-01-01) [Support]

    AdobePDFViewerNPAPI: 10.1.16 (2015-11-12) [Support]

    FlashPlayer-10.6: 22.0.0.209 - SDK 10.9 (2016-07-12) [Support]

    Silverlight: 5.1.50428.0 - SDK 10.6 (2016-07-01) [Support]

    QuickTime Plugin: 7.7.3 (2016-05-23)

    Flash Player: 22.0.0.209 - SDK 10.9 (2016-07-12) [Support]

    iPhotoPhotocast: 7.0 - SDK 10.8 (2013-06-07)

    SharePointBrowserPlugin: 14.6.6 - SDK 10.6 (2016-08-09) [Support]

    AdobePDFViewer: 10.1.16 (2015-11-12) [Support]

    WidevineMediaOptimizer: 6.0.0.12757 - SDK 10.7 (2014-06-09) [Support]

    JavaAppletPlugin: 15.0.1 - SDK 10.11 (2015-02-21) Check version

3rd Party Preference Panes: ⓘ

    Flash Player (2016-06-28) [Support]

Time Machine: ⓘ

    Time Machine not configured!

Top Processes by CPU: ⓘ

        13%    mdworker(6)

         5%    Mail

         2%    kernel_task

         1%    Jungle Disk Workgroup

         1%    Dropbox

Top Processes by Memory: ⓘ

    509 MB    kernel_task

    307 MB    com.apple.WebKit.WebContent(3)

    229 MB    firefox

    188 MB    mdworker(6)

    143 MB    Mail

Virtual Memory Information: ⓘ

    108 MB    Free RAM

    3.89 GB    Used RAM (581 MB Cached)

    158 MB    Swap Used

Diagnostics Information: ⓘ

    Aug 12, 2016, 06:25:48 AM    Self test - passed

    Aug 10, 2016, 10:38:21 AM    /Library/Logs/DiagnosticReports/VTDecoderXPCService_2016-08-10-103821_[redacted ].cpu_resource.diag [Details]

        /System/Library/Frameworks/VideoToolbox.framework/Versions/A/XPCServices/VTDeco derXPCService.xpc/Contents/MacOS/VTDecoderXPCService

Thanks! Had a similar issue. Will give the combo update a try.

Regards... Andy

Em, I've already installed the update (not in Safe mode), so how can I re-install the update in Safe mode? I've re-booted in Safe Mode, but still the problem persists. Are you suggesting the combo in Safe Mode?