Thank you, GodTanu! Glad you like it.
I’ve just updated the app to keep a tally of your payments through each email address, so if you’ve paid less than the price (currently 30 XEM) it’ll say that you need to pay more. Simply pay the remaining balance and it’ll let you have the download (which is now served slightly differently, to hopefully be more secure). I’ve put a text file in the zip now, so if the download works you should be able to unzip it successfully.
Please check that it works as expected, and do let me know if there’s anything else you think I should do. Thanks!