RUZENKA

Hello, I need to advice about my lost notes. Today I opened the Evernote app after a few months. I made there many notes which I saw today in it after opening, but suddenly there opened a window with information about upgrading the app and I couldn't get over it to check my old notes. So I logged in and went to see my notes, but then I found out that there is none of them. Is it possible to get these notes back? Thank you for your answers