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).
Before mounting and starting the installation, execute the following procedure to unblock your ISO file:
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Open the folder containing the ISO file on Windows Explorer;
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Right-click the file and select the “Properties” option;
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Check the “Unblock” option, if available;
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Click on the “Apply” button and then the “OK” button.
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.

