See https://forums.opera.com/post/181367. Try a standalone installation of Opera, Opera Beta and Opera Developer in an "Opera Eagle Get Test" (for example) folder so you can test the extension in fresh profiles to see if there's any difference.
@rismarved said in Eagle Get Addon is not working on Opera:
I get to download the file, but when I press play, its NOT readable on VLC or Media Player.
I'd open the file in a text editor or hex editor program to try and see what the file actually is. Maybe it's not actually a video file for so reason. Or, maybe the file just doesn't have the right file extension (although, that should be a problem for VLC). Also, in VLC, under one of the menus, looks at the video/file information. It might say what type of video it is if it's actually a video.