Here’s the thing – if you have an old account that you’ve forgotten the password for, you can safely reset it. You should then use that password when you sign in to AxCrypt to work with your files. In the future after the upgrade, you’ll just be using that password. If your existing password for your files is strong enough, do use that. It’ll make the use much easier.
Go here to reset your password (this link is in the program as well): https://account.axcrypt.net/Home/PasswordReset .