Hi Michel,
Thank you for contacting us and I'm sorry about the issue you are experiencing. mSecure 5 is the first and only version of mSecure to use an account system. I see that you created an account for the email address you are using on this forum on July 12th 2017. If you have forgotten your account's password, you can learn how to reset your account here: https://support.msecure.com/support/solutions/articles/36000064228
Michel