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This issue was introduced with update KB4019472 for Windows 10 Version 1607 (Anniversary Update) and Windows Server 2016 and KB4016871 for Windows 10 Version 1703 (Creators Update). Please note, that newer cumulative updates like Windows 10 version 1709 would also contain this update.
A full list of cumulative updates which contain or replace KB4019472 can be found in the Windows Update Catalog in the 'Details' tab.
KB4016871 can be found here.

The error only occurs with the 64bit version of TreeSize, not affected is the 32bit version of TreeSize.

Since V6.3.6 TreeSize is compatible with Windows 10 and Server 2016 with update KB4019472. Customers with valid maintenance can download the latest version of TreeSize, which is compatible with Windows 10 in our customer area.

Do not install Windows 10 Update KB4019472 if you intend to use an older version of TreeSize.

The "Check for Update" button in the "Help" menu can be hidden in two ways:

Running TreeSize with special command line options

If you execute this command line after the installation, the "Check for Update" button will be no longer available:

TreeSize.exe /NOGUI /ShowCheckForUpdate False /SAVESETTINGS

Please add the full path to TreeSize.exe, e.g.
"%ProgramFiles%\Jam Software\TreeSize Professional\TreeSize.exe"

Please note: Use the following command line call to deactivate the automatic check for update:

TreeSize.exe /NOGUI /CheckForUpdateOptions\CheckForUpdatesAutomatically False /SAVESETTINGS

Deploying a configuration file

First you need to edit the XML-based configuration file of TreeSize. The configuration file is located at the following path by default:

%APPDATA%\JAM Software\TreeSize Professional

(Please note that %APPDATA% is an environment variable that will be resolved automatically by Windows if it is entered in the address bar of the Windows Explorer.) 

Before proceeding, please ensure TreeSize is closed.

In the folder above, you will find a file called "GlobalOptions.XML" Please open the file with a suitable text editor (Notepad, Notepad++,...) and search for the following line: <ShowCheckForUpdate>True</ShowCheckForUpdate>

Please set the value "True" to "False". If you start TreeSize again, you will notice that the "Check for Update" button is no longer available.

Please note: In order to deactivate the automatic check for update in the configuration file change the following value from "True" to "False"
<CheckForUpdatesAutomatically>True</CheckForUpdatesAutomatically>

There is no TreeSize App for Android. But you can scan your mobile device using the TreeSize Windows desktop app, if your mobile device is connected to your PC via USB and is unlocked. For more details on this subject please visit our web page.

As an iOS protects its internal file system from running apps, an application like TreeSize wouldn't be possible for iPhones. You may use "Settings > General > iPhone Storage" the get a rough estimate what takes up the space on your iPhone.

There is a small  blue progress bar left of the root node which disappears when the scan is finished. Also the scan progress is shown in the status bar on the bottom of the window. During a scan the small hourglass on top of the folders indicate that the folder is not fully scanned.

Typically our products use the same ports and protocols as Windows Explorer. Port 445 is needed for SMB/CIFS communication. Ports 137-139 are needed for NetBios/Name resolution only . Without it you will have to access machines by IP address opposed to NetBIOS name. Example \\192.168.1.100\share_name opposed to \\my_file_server\share_name. So port 445 is sufficient if you can work with IP addresses only.