Digital Editions on new Mac crashes instantly every time I open it

TItle says it all.  Just made switch from Windows to Mac and have tried installing Digital Editions 4.5.12.  The first time I opened it I authorized it.  Since then every single time I open it it immediately freezes iand shows the spinning beach ball of death.  I've tried unstalling and reinstalling but every single time it freezes the second I open it.  I can't even deauthorize user if that's the problem. The second I try to enter my password to deauthorize it freezes.  I deauthorized myself from my windows Digital Editions application if that was the problem but it makes no difference.  I can't find an older version of Digital Editions to download.  Help.  I don't want to have to keep using my dinosaur of a WIndows laptop just for when I need to open a book using Digital Editions.