To install a .xap or .appxbundle file on a Windows 10 Mobile device, you must bypass the standard store. [WP8]Opera Mini - 4PDA
Because you aren't using the Store, you'll need to "sideload" the app.
In 2015, Microsoft ended support for Windows 10 Mobile's predecessor, Windows Phone 8.1, and shifted focus towards Android and iOS. As a result, many apps, including Opera Mini, are no longer compatible with Windows 10 Mobile.
Compresses web pages by up to 90%, making browsing viable on older 2G/3G networks.
To install a .xap or .appxbundle file on a Windows 10 Mobile device, you must bypass the standard store. [WP8]Opera Mini - 4PDA
Because you aren't using the Store, you'll need to "sideload" the app. opera mini xap for windows 10 mobile link
In 2015, Microsoft ended support for Windows 10 Mobile's predecessor, Windows Phone 8.1, and shifted focus towards Android and iOS. As a result, many apps, including Opera Mini, are no longer compatible with Windows 10 Mobile. To install a
Compresses web pages by up to 90%, making browsing viable on older 2G/3G networks. Windows Phone 8.1
