It should be fixed now. Could you check again?
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All TV Store applications have to support 1280×720 resolution. Other common TV resolutions (1920×1080, 960×540) are currently not supported. Although the TV Store browser itself supports regular scrolling, applications should be designed not to require scrolling, and if needed should provide their own custom mechanisms for displaying long lists of items or content.
Please check link below:
At this moment Sling TV is not available in Opera TV Store.
If you wish to have this content for your private use,
please use the URL Loader application from Opera TV Store.
You can also set up your particular TV,
set-top-box or Opera TV Emulator to be "paired"
with your Opera TV Store Submission portal account,
which will give you the access to application
through Opera TV Store: Develop section.
Please, check the following link:
Opera Moderation Team