I have been using the windows app for a few months to learn Italian. I logged onto the website for the first time only to discover to my disappointment that everything I had done, despite keeping everything orange all the time was only level one!. Duolingo should either discontinue the windows app or upgrade it! Not everyone out there has an android or apple device, there are many windows tablet users out there!
Whew, the Windows app must be like using a time machine.
If its still usable, there should be no need to discontinue it; you seem to have found it useful if you were using it for months.