Try downloading the file again from a different mirror site.
To make sure this guide is exactly what you need, could you clarify: Orrar archive containing the app to install on the phone)? Knowing this will allow me to refine the source links. Download Android Assistant4 rar
This guide explains how to safely locate and download the (or similar legacy versions) archive file (often distributed as a .rar or .zip file) to manage your Android device from a PC. ⚠️ Important Security Warning Try downloading the file again from a different mirror site