Hello the CAN plugin version 1.16.0 (in FreeMASTER 3.2.6.3) indeed adds the CAN-FD support for ZLG and some other vendors. It also adds support for the new ZLG ZCAN library. After the registrer.bat has been run, we can be sure the plug-in is correctly registered in the system.
I cannot replicate the issues you are facing. The connection string for the ZCAN devices appears normally in my case: drv=ZCAN;port=1;bitrate=500000;cmdid=0x7aa;rspid=0x7aa;tmo=500

Please try the following:
- Paste the ZCAN string to the Options dialog manually and then open the plug-in configuration. Then close it without making any changes. Will it still show the error?
- Just as an experiment, try to enable the CAN-FD mode for the USBCANFD_200U device and press OK.
- Try to select another CAN driver, for example IXXAT, even if you do not have any physical device, then press OK.
Please let me know if it shows the error in all 3 cases.
Thanks,
Michal