Mirror Tool - Windows

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The Mirror Tool is necessary for offline detection engine updates. If your client computers do not have an Internet connection and need detection engine updates, you can use the Mirror Tool to download update files from ESET update servers and store them locally.



The Mirror Tool downloads detection engine updates and other program modules only, it does not download PCUs (Program Component Updates) and ESET LiveGrid® data. It can also create a  full offline repository. Alternatively, you can upgrade products individually.




The Mirror Tool does not support Windows XP and Windows Server 2003.

The target folder must be available for sharing, Samba/Windows or HTTP/FTP service, depending on how you want to have the updates accessible.

You must have a valid Offline license file that includes the Username and Password. When generating a license file, be sure to select the check box next to Include Username and Password. Also, you must enter a license Name. An offline license file is needed for the activation of the Mirror Tool and generation of the update mirror.


Before running the Mirror Tool, you need to have the following packages installed:

Visual C++ Redistributable for Visual Studio 2010

Visual C++ 2015 Redistributable x86

How to use the Mirror Tool

1.Download the Mirror Tool from the ESET download page (Standalone installers section).

2.Unzip the downloaded archive.

3.Open the Command Prompt and navigate to the folder with the MirrorTool.exe file.

4.Run the command below to view all available parameters for the Mirror Tool:

MirrorTool.exe --help





All filters are case sensitive.




When you use it, you must specify the full URL of the update server.


You must specify a path to your offline license file (as mentioned above).


You can specify language codes, for example for French type fr_FR. Other languages codes are in the table below. To select more languages, separate them by a space, for example: en_US zh_TW de_DE


You can specify a string that the Mirror Tool uses as a download filter. The Mirror Tool downloads only files which contain the string in their common name. You can select more products by adding more arguments, for example: --productFilterForRepository Antivirus Security

The Mirror Tool downloads all selected languages for each selected product.


No argument needed. Use this parameter to include legacy packages in the download. If not used, legacy packages are not downloaded. You can find out which products are legacy ones in the Software Install Client Task menu Settings > Package to install > Choose package > Legacy.


No argument needed. If set, only level updates will be downloaded (nano updates will not be downloaded). Read more about update types in our Knowledgebase article.




Before using the --mirrorFileFormat parameter, ensure that you environment does not contain both older (6.5 and older) and newer (6.6. and later) ESET security product versions. The incorrect usage of this parameter may result in incorrect updates of your ESET security products.

You can specify which type of update files will be downloaded. Possible values (case sensitive):

dat - Use this value if you have environment only with ESET security product versions 6.5 and older.

dll - Use this value if you have environment only with ESET security product versions 6.6 and later.

The parameter is ignored when creating a mirror for legacy products (ep4, ep5).


This optional parameter applies to the Mirror Tool distributed with ESET PROTECT 8.1 and later.

The Mirror Tool will download update files compatible with ESET PROTECT repository version you specify in the parameter argument in format x.x or x.x.x.x, for example: --compatibilityVersion 8.1 or --compatibilityVersion



The Mirror Tool creates a structure of folders different from what Endpoint mirror does. Each folder holds update files for a group of products. You have to specify the full path to the correct folder in the update settings of the product using the mirror.

For example, to update the ESET PROTECT 8 from the mirror set the Update server to (according to your HTTP server root location):


Note: The era6 mirror folder is common for these ESET remote management solutions: ERA 6, ESMC 7, ESET PROTECT.

arrow_down_businessLanguage codes table

MirrorTool.exe --mirrorType regular ^

--intermediateUpdateDirectory c:\temp\mirrorTemp ^

--offlineLicenseFilename c:\temp\offline.lf ^

--outputDirectory c:\temp\mirror

Here is an example of more advanced configuration for an offline repository with selected products, languages and enabled download of legacy files:

MirrorTool.exe --repositoryServer AUTOSELECT ^

--intermediateRepositoryDirectory c:\temp\repoTemp ^

--outputRepositoryDirectory c:\temp\repository ^

--languageFilterForRepository sk_SK fr_FR de_DE ^

--productFilterForRepository Antivirus Security ^


Mirror Tool and Update settings

To automate downloads for modules updates, you can create a schedule to run the Mirror Tool. To do so, open your Web Console and click Client Tasks > Operating System > Run Command. Select Command line to run (including a path to the MirrorTool.exe) and a reasonable trigger (such as CRON for every hour 0 0 * * * ? *). Alternatively, you can use the Windows Task Scheduler or Cron in Linux.

To configure updates on a client computer(s), create a new policy and configure Update server to point to your mirror address or shared folder.



If you are using an HTTPS mirror server, you need to import its certificate to the trusted root store on the client machine. See Installing the trusted root certificate in Windows.



Read this Knowledgebase article to set up Mirror Tool chaining (configure Mirror Tool to download updates from another Mirror Tool).