The Microsoft Store for Windows Phone 8.1 and earlier is permanently closed. You cannot download apps directly to your phone anymore. You must find .XAP files online.
RetroMobile Archive Reading Time: 8 Minutes windows phone xap archive full
Finding a "full" archive of Windows Phone XAP files is challenging because most original Store downloads are encrypted, making them difficult to sideload without specific community-made workarounds . However, several enthusiast-maintained repositories offer extensive collections of both (WP 8/8.1) and APPX (W10M) files . Top Windows Phone XAP Repositories The Microsoft Store for Windows Phone 8
: Many "abandonware" games—like Rule The Kingdom or Jet Set Go —were never decrypted before the servers went dark, making them "holy grails" for modern collectors. windows phone xap archive full