Helper tool to get Unitys SystemInfo.deviceUniqueIdentifier.
Just start the EAM GetClientHWID.exe to create a file called EAM.HWID containing the HWID in the same fodler as the .exe.
You can also start this tool with the arguments: EAM GetClientHWID.exe -batchmode {Path\To\Folder} to create the EAM.HWID in the desired folder.