I can´t believe it happened. After coding 15 interviews, without quitting Nvivo (but saving every hour or so), I saved and quit correctly the program.
Now, I have the message I attach.
I did a copy of the file. I changed the name and I can open but with only 3 interviews coded (the ones I did the last time I quit Nvivo).
I can´t believe that after paying a lot of money it happened without doing something wrong.