ADE has stopped working

Now I'm getting this message whenever I try to download a book from the library!  Using Windows 10 and a Kobo. 

I have absolutely no idea how to go forward - no idea where to even start.  Basically I'm hooped.

I have uninstalled and reinstalled ADE at least three times.  I restarted my computer several times, I've even yelled at it and made severe unpleasant threats, but nothing has helped.

Anyone - any suggestions, please!