Thank you for your kind reply. In the past I started with the free version but after a bit of time I paid for the licence. I have reached the support for ask how to recover the master passwored. They said to me that is not possible. In the meantime I need to change the smartphone so I reinstall Enpass and now I can enter my previous backup, but like before, I haven't the master password, so, for example, I cannot use enpass on my pc like before (with the master password). So I need to return to the full use of the app, both with the touch id and with the master password. When I re-install Enpass, if I choose existing user, Enpass ask me the master password to enter, and if I choose new user, I can build a mew account but I have to pay to have the licence (although I have already a licence for Enpass).