Reference the LabVIEW NI SoftMotion Readme Files to make sure that your version of NI SoftMotion and the Industrial Communications for EtherCAT driver are compatible.
If you need to downgrade the Industrial Communications for EtherCAT driver, uninstall the more recent version first before installing the appropriate version of the driver. You can follow the KnowledgeBase article, How Do I Uninstall or Repair National Instruments Software, to properly uninstall the driver.
The Industrial Communications for EtherCAT drivers can then be found through ni.com/drivers.
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