First, the fine print. Downloading XAP or APPX files from or community backup sites exists in a legal gray area.
Since Microsoft has largely removed the "Download and install manually" option from the official Store, you must use community archives Microsoft Learn Windows Việt Download Windows Phone Apps -XAP APPX Files- to PC
Sideloading XAPs often requires specialized developer tools: First, the fine print
Downloading Windows Phone apps to your PC is a relatively straightforward process. Here are the steps: Download Windows Phone Apps -XAP APPX Files- to PC
The window to download Windows Phone Apps (XAP & APPX files) to a PC is closing fast. Microsoft is gradually purging old CDN links. Archive.org uploads face legal takedowns from defunct publishers who still own the IP.