If you are trying to recover an old file you once had on My Opera:

There is a well-known party game called King of Opera often available for download as an APK on sites like Uptodown. "King Cell" may be a specific user or a mislabeled mobile file from that era. How to Safely Handle This Download

Use tools like the Web Archive Viewer extension to view cached versions of older websites. Download King of Opera 1.16.41 for Android | Uptodown.com

Since the original my.opera.com is inactive, any current download prompt using this name is likely coming from a third-party mirror or a potentially untrusted source . Verify File Extensions:

Common for very old "basic" phones. These are generally safe but rarely used on modern smartphones.