So I was having the same issues some people were having with this extension. in the past I donated to get the download app because it was just easier and the extension was broken. but now that says "this app has expired" every time I clicked on it. This is because its simply out of date, you should have gotten an email with a thank you for donating and a link to the app, go back there and re-download the installer, for me this is now fixed. I would like to see a message or a direct link to the updated installer in the extension description though.

P.S. old version 0.7.1 new version 0.8.0 of the installer