Installing and running Opera Mini (.xap) on Windows 10 Mobile is still possible through sideloading, though the browser was retired from the official Store years ago. While it offers exceptional data savings (up to 90%) and can still browse the web today, it suffers from significant limitations on modern sites due to its reliance on outdated proxy servers. 1. How to Install Opera Mini (.xap) on Windows 10 Mobile
These local features generally continue to work as they are stored on the device. However, synchronization with an Opera Account usually fails due to outdated authentication protocols (OAuth changes).
On Device: Open the File Explorer app on your phone, locate the .xap file, and tap it to install.