I used the most recent version to convert the ONNX. But to be honest, I will not support you in converting the models, because this is out of scope here. Please open an issue at ultralytics if you need help with preparing the ONNX model.
The future update of the YOLONetwork will not solve this.
If there is a problem with using an ONNX within deep-vision-processing, please file an issue with proper description of your system, error messages and the onnx file if possible.