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You need the specific ID of the app you want.

| The Bad Way | The Better Way | | :--- | :--- | | Hunting random Russian forums for DLLs. | Using Adguard or Fiddler for clean source URLs. | | Downloading via a slow phone browser. | Downloading via PC with a Download Manager (IDM). | | Installing directly from Store (no backup). | Saving the .xap or .appx to an external HDD. | | Trusting a single third-party installer. | Validating the signature via SignTool (for APPX). |

If an app cannot be downloaded, it can often be extracted from a phone backup or a Flash ROM image.

While downloading XAP or APPX files for apps you have already purchased is legally protected as a backup under fair use in many jurisdictions (Digital Millennium Copyright Act Section 117), downloading paid apps you never bought is piracy.

Move the file from your PC to your phone’s internal storage or SD card via USB.

Even with this guide, you will hit walls. Here is how to fix them: