As of the current date, the Microsoft Store on legacy devices often faces connectivity issues due to backend changes by Microsoft.

: It verified if your specific handset model and mobile operator were supported for the Windows 10 upgrade. Space Management

: Some third-party sites like WindowsViet host legacy .XAP or .APPX files for manual installation, though this requires "developer mode" or interop-unlocking the device. Recommended Alternative: OTC Updater Tool