MuseScore application quit unexpectedly

Hello, my MuseScore application was quit unexpectedly and now the file cannot be opened. I always clicked "save" when working. However, this huge work (I wrote the orchestral score for 3 days) does not open in any way. I tried to rename my file and unfortunately the file disappeared from MuseScore like it didn't exist. Please, help me to find it and open. There is the report about mistakes, but I don't know how to download it, and to whom to send.
Best regards,
Olga.