Thank you for contacting us. mSecure 4 has no pro version. The way the older version works is that you have to pay for the app before you can download it. mSecure 5 has paid accounts and our mSecure 5 license is called an mSecure Pro license. The reason for this is because mSecure 5 is free to download. However, most of the features require a license or Pro account in order to function.
mSecure 5 is a brand new app, and it marks the first time in the history of our company that we have charged for an upgrade to mSecure. We wanted to make it a free upgrade for our customers, but with the current landscape of application development, it was not feasible for us to do so.
You can always download mSecure 3 or 4 again from your purchase history. Here is an article that shows you how: https://support.msecure.com/en/support/solutions/articles/36000064249-how-to-download-previous-versions
Note that the email address for firstname.lastname@example.org just recently created an account in our system. Accounts are also new with mSecure 5. mSecure 4 and the previous versions only have device specific unlock passwords with no account system. The account for email@example.com is a free account created on the 21st of this month. We do offer previous customers a 33% off discount to upgrade to mSecure 5. Please submit a ticket or email us at firstname.lastname@example.org if you'd like to take advantage of that offer.