We removed FTS 15 from the store for strategic reasons, so it is no longer available to new users.
For further information (existing users only), please see the links below:
http://www.windowscentral.com/how-to-reinstall-apps-windows-phone (Windows Phone)
It is also worth noting that unfortunately, Apple removed support for 32 bit apps in iOS 11, so our older apps will not run on devices running iOS 11 or above.
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