Is this application available on Windows store or Software Informer?
This application is developed to run on Windows, therefore it's available on Software Informer (Windows related app with Windows applications). The Windows Store offers downloads for mobile phones that are running the Windows Phone operating system.
I have extender the search query and found that you can download Foxit MobilePDF through Windows Store: https://www.microsoft.com/en-us/store/apps/foxit-mobilepdf/9wzdncrfj11z
Download through Software Informer: http://foxit-reader.software.informer.com/