If you've tried all the above and still see the error, consider these final checks:
Lumion’s legacy code (pre-v12) has difficulty with non-English characters. If your Windows username contains accented characters (e.g., "José", "Müller") or if you installed Lumion in a folder with spaces or symbols (e.g., C:\Lumion 12\ is fine, but C:\Lumion★\ is not), the channel loader cannot parse the path.
For modern editions (such as Lumion 2023 or newer), look for the file named . For legacy editions, locate Redist2015-2019 . If you've tried all the above and still
For Lumion 10 users specifically, if the above fails, try moving onnxruntime.dll from the 3rd folder to the root Lumion installation folder as recommended on the Lumion Knowledge Base .
If you are receiving this error on a legitimate license, your computer's hosts file might be blocked or altered, preventing the software from communicating with the licensing channel. For legacy editions, locate Redist2015-2019
: Open the main application executable as an administrator. 3. Repair Microsoft Visual C++ Redistributables
Follow this guide to restore the missing files and prevent the error from recurring. Step 1: Force Close Lumion : Open the main application executable as an administrator
If you are using the affected Lumion versions, this is the primary and most direct solution recommended by Lumion. It's a simple file move.
Files were not fully downloaded or installed correctly.