What is wrong with this sentence? The promo code gives you a discount on the APK version of the Android app and the Supporter Certificate.
Also, on our website (where you bought it) there is this big blue banner that says a Supporter Certificate is not valid for Android and iOS:
Sure, send me a direct message with the email address you used to purchase it and we will initiate the refund process. You can also send it to support@cryptomator.org