Thank you for contacting us. We no longer offer the 50% off discount. That is a much older discount that was available when we released mSecure 5 around May 2017. The 33% off discount is the discount we provide now almost 2 years after the release of mSecure 5.
I'm not sure why it keeps offering you a 50% discount. We do not even offer a discount in mSecure 4 anymore. We simply advertise that mSecure 5 is available and link to mSecure 5 on the App Store. Your advertising seems to be old and not updated. Likely indicating that you haven't connected to the internet with mSecure 4 opened in a long time. Note that WiFi syncing and all the other syncing options were released in an update in Jan. 2018.