It is time to remove this post, or maybe just unpin it.
The app was removed from all smart televisions yesterday, 2/6/2018.
Leaving it here just confuses people into thinking Comcast has 4K, when all there is Netflix, or possibly Olympics if it works.
Unpinned and locked. Thanks!
Please note that as of February, 9, 2018, the Ultra HD Sampler app for Samsung and LG Smart TVs is no longer available for use.
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