Thank you for contacting us and I'm sorry about the issue you are experiencing. You are correct, only customers with an mSecure 5 license can use all the mSecure 5 features including the fingerprint unlock. If you have forgotten your account's password, you can learn how to reset your account and create a new account password here: https://support.msecure.com/support/solutions/articles/36000064228
Please note that going through an account reset will not affect your mSecure 4 or lower information.
Once the Fingeprint feature is disabled, the only way to enabled it again is to unlock the app using your account password and go to the Settings to re-enable the feature. I can extend your trial period and you can use all the features again for your account. However, you'll have to unlock the app using the account password in order to re-enable the feature.
If you are using mSecure 4, an account reset will not affect that information. However, it will destroy your mSecure 5 information. After an account reset, mSecure 5 will walk you through a migration process again if mSecure 4 is installed on the same device. Otherwise, you can always restore your information from a .msib (mSecure 5) or .msim backup file created in the previous versions of mSecure.
Yes, the only requirement we have for account passwords is for them to be at least 4 characters long. Did you need me to extend your trial period here?