Last month we have upgraded our client's Premier 2013 to Premier 2020 easily. We just open the QBW file of 2013 version on new installed 2020. It was converted completely and works fine. For your QBW file of 2011, you should try converting it to any version between 2013-2019 prior to open on 2020. Should you need any help, send a private message to us.
