I'm sorry for the long wait in my reply. As long as you still have mSecure 4 installed on one of your devices, you should have no problem transferring your information over to mSecure 6. Have you downloaded mSecure 6 yet and if so, were you able to create an account?
If you were able to create an account in mSecure 6, the next steps would be to simply create a backup in mSecure 4 and restore from that backup in mSecure 6. I can help you with that if needed, so let me know where you're at in the process, and I'll send instructions.