At my workplace which has extreme security I do get an error with simple listing downloads. All the listings have downloaded so I'm not sure why the error. Are your listings downloading too ?
This does not happen at home. Under Tools there is a Check Etsy operation. It would be useful to know what that says,
If you press control and Print screen buttons at the same time you can save it and then send it to me in a convo.
The real issue is that you can't authorize. My understanding is that when you begin the authorization process you don't see ANYTHING on the screen? I have a walk through on the website
http://zimpro.co/ZetsyTutor1.html. This a bit different now in this version but you should still see "An application is requesting ...." If not, that tells me something is blocking this from appearing. I'll look into some alternatives into authorization in the next day or so. I'll see what happens at work too. I have problems with all kinds of programs at work because of the high security settings.