# MES installation fails due to "blocked" ISO

**URL:** <https://community.criticalmanufacturing.com/t/mes-installation-fails-due-to-blocked-iso/682>\
**Category:** Deployment\
**Tags:** installation, v11.3\
**Created:** [January 13, 2023, 11:57pm UTC](https://community.criticalmanufacturing.com/t/mes-installation-fails-due-to-blocked-iso/682 "2023-01-13T23:57:52Z")\
**Posts on this page:** 5\
**Page:** 1

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**Author:** ![Joao\_Moreira](https://avatars.discourse-cdn.com/v4/letter/j/b9bd4f/32.png) [@Joao\_Moreira](https://community.criticalmanufacturing.com/u/Joao_Moreira)\
**Post date:** [January 13, 2023, 11:57pm UTC](https://community.criticalmanufacturing.com/t/mes-installation-fails-due-to-blocked-iso/682/1 "2023-01-13T23:57:52Z")

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Random errors may occur during the CM MES installation process if it is initialised using a blocked ISO file. This occurs when Windows Attachment Manager marks ISO files as blocked (more information here).

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**Author:** ![Joao\_Moreira](https://avatars.discourse-cdn.com/v4/letter/j/b9bd4f/32.png) [@Joao\_Moreira](https://community.criticalmanufacturing.com/u/Joao_Moreira)\
**Post date:** [January 13, 2023, 11:58pm UTC](https://community.criticalmanufacturing.com/t/mes-installation-fails-due-to-blocked-iso/682/2 "2023-01-13T23:58:53Z")

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Before mounting and starting the installation, execute the following procedure to unblock your ISO file:

1. Open the folder containing the ISO file on Windows Explorer;

2. Right-click the file and select the “Properties” option;

3. Check the “Unblock” option, if available;

4. Click on the “Apply” button and then the “OK” button.

 ![](https://canada1.discourse-cdn.com/flex050/uploads/community_criticalmanufacturing/original/1X/da37e54a87aab68c3bc590f65f45ac01577f9491.png)

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<div class="post-metadata">

**Author:** ![Joao\_Moreira](https://avatars.discourse-cdn.com/v4/letter/j/b9bd4f/32.png) [@Joao\_Moreira](https://community.criticalmanufacturing.com/u/Joao_Moreira)\
**Post date:** [January 14, 2023, 12:08am UTC](https://community.criticalmanufacturing.com/t/mes-installation-fails-due-to-blocked-iso/682/3 "2023-01-14T00:08:42Z")

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e.g. of installation error:

 ![](https://canada1.discourse-cdn.com/flex050/uploads/community_criticalmanufacturing/original/1X/dc3af1d5555328073ad51f7da486a366a20a2d28.png)

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<div class="post-metadata">

**Author:** ![Joao\_Moreira](https://avatars.discourse-cdn.com/v4/letter/j/b9bd4f/32.png) [@Joao\_Moreira](https://community.criticalmanufacturing.com/u/Joao_Moreira)\
**Post date:** [April 21, 2023, 9:58pm UTC](https://community.criticalmanufacturing.com/t/mes-installation-fails-due-to-blocked-iso/682/4 "2023-04-21T21:58:37Z")

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Similar issue occurs in case customization package (zip file) is blocked.

As so, before starting an installation check that both the ISO and CustomPackage.zip files are not blocked.

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**Author:** ![system](https://yyz2.discourse-cdn.com/flex050/user_avatar/community.criticalmanufacturing.com/system/32/23_2.png) [@system](https://community.criticalmanufacturing.com/u/system)\
**Post date:** [August 27, 2026, 5:25pm UTC](https://community.criticalmanufacturing.com/t/mes-installation-fails-due-to-blocked-iso/682/5 "2026-08-27T17:25:21Z")

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