The uninstall form uses Google Analytics to record answers. I suspect you've configured your browser to block tracking content, which is why it doesn't work for you. Thanks for letting me know this - I've updated the error message so that other people would understand why it doesn't work.

As for your actual feedback: there is no way to achieve this from the extension. The extension doesn't know where the companion executable is - it is the browser that connects the two applications.

However, you can enable debugging, then you can open the companion log file, which will contain the path to the executable.

Out of curiosity, why do you need to know the location? What were you trying to change in the registry? Is this the reason you uninstalled it? Maybe I can help.