Move your Documents/Lumion folder out of OneDrive or Dropbox to a local drive.
Go to your Lumion installation folder: C:\Program Files\Lumion 10.x\3rd . Locate the file named onnxruntime.dll . Move your Documents/Lumion folder out of OneDrive or
If these steps do not clear the error, you may have a corrupt installation. In this case, disable your antivirus temporarily, re-download the installer from your Lumion Account, and perform a clean reinstall. How do you resolve start-up problems? - Knowledge Base If these steps do not clear the error,
Look for recently blocked items related to the Lumion installation path (usually C:\Program Files\Lumion [Version]\Channels ). Step 4: Select the item and choose Actions > Restore . 2. The Permanent Solution: Set Folder Exclusions - Knowledge Base Look for recently blocked items
In Windows Security, go to Virus & threat protection settings > Manage settings > Exclusions .
Click Add an exclusion and select the following "Folder" paths: C:\Program Files\Lumion [Your Version] C:\Users\[YourUsername]\Documents\Lumion [Your Version]
The most common culprit is or a third-party antivirus (like Avast or McAfee) flagging Lumion’s "Channels" folder as a false positive. Step 1: Open Windows Security > Virus & threat protection . Step 2: Click on Protection history .