To troubleshoot the Advanced Uploader, you'll first need to open the Java console.
- Open Control Panel->Programs->Java, on the Advanced tab, click the “Java console”->“Show console”, then click “OK”.
- Open ‘System Preferences’, then click on the ‘Java’ icon, on the open ‘Java Control Panel’, click ‘Advanced’ tab, click the Java console->Show console, then ‘Ok’.
Once it's enabled, you can reopen the Advanced Uploader and the Java console will open with it.
You can copy the text in the console and send it to Flight Support: https://www.canto.com/flight/support/