I have this same issue, this is insanely frustrating.
I have not moved any files, every file is in the exact same position they were created c:/user/AFD/ where i have several projects as .mpdp files, as well as the associated project folder [project name].mpdp.projectdata
everything worked fine until the trial period suddenly expired, with NO prior warning as to what that would entail, but now everything is gone.
how can i get my mixes back??