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.dll files found under '\Program Files (x86)\ZyLAB\EDiscovery\Ediscoveryservice\Assemblies\Performers\' folder are locked by MS Windows.
Run the following PowerShell script to unlock the folder on the eDiscovery Service node:
Get-ChildItem -Path 'X:\Program Files (x86)\ZyLAB\EDiscovery\Ediscoveryservice\Assemblies\Performers\' -Recurse | Unblock-File
where 'X' is the name of the drive where application is installed.