I wasn't sure where to post this, but I just got a Nokia Lumia 640 XL LTE and can't find the Artrage app in the windows store or download it from the website. I had a Nokia Lumia 1520 last year and had no problems downloading and using the app. They both run Windows 8.1 with the same processor. Does anyone know why it isn't downloadable on my new phone?? If I update to Windows 10, will it work then? They are exactly the same phone except for screen size. I'm so frustrated because Artrage is by far the best mobile art app out there. Thanks!