I am running chromecast using this browser preety easily from the settings area. Possibly you need to uninstall opera clean the app data and then install it. Once you do that i hope there will be no issue. To stream media you can get help from here:-
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RE: Cant find "enable chromecast in either beta 50 or dev 51..Opera for Windows
RE: chromecast for OperaOpera add-ons
Opera chromecast support works very smoothly. So why not you try it after opera 50 this feature is available nativily. You can get help from here:-