Thanks for your quick answer.
I don't know how, but the problem solved itself, after uninstalling the desktop version for Windows (Revo uninstaller suggested by agsteele) and reinstall again the latest version. Now I have the same access than before the problem.
I wouldn't have unsync anything if the autoupdated version worked. So when I expressed my complain, Evernote didn't allow me to access from any device/browser nor at least to know from which devices/browsers could I access. That is completely unfair, in my opinion. After two unsyncs I understand that I can't change the device/browser but I should be able to see from which devices I can get access to my data.
Important to read that the lock is not for the present month (I was wrong about that), but for the following 30 days.
Thanks again