If you purchased Foxit PhantomPDF from Microsoft App Store previously, your program and license will be offered by Microsoft App Store, to recover the licensed Foxit PhantomPDF, you can refer to the below.
Open Microsoft App Store by your Microsoft Account, in Library, find a program named only "Foxit PhantomPDF"( not " Foxit PhantomPDF perpetual license") under Apps, click on Download, the version installed will be the licensed Foxit PhantomPDF by your Microsoft Account.
If the current account you are logging into Microsoft Store is not the one that you used to purchase Foxit PhantomPDF,please log out of the current account,and follow the above steps to find and install the Foxit PhantomPDF program from the apps list under Library. After the installation,please log into the corresponding account which has Foxit PhantomPDF licensed prior to reusing the Foxit PhantomPDF in your device.