Misconception.satcrazy said:1.4 seems to be the latest.
There has only been 1 update to HDMI cables and that was version 1.3. Version numbers are mostly to due with hardware and software and not the cables.
To the original poster
You gave us zero information on your setup. No brand or model of cable, no info on source or display, etc...
All I can tell you is 50 feet is a hell of a long way to run an HDMI cable. Most cheap cables will not pass a 1080p signal at that distance, and even a good cable would have trouble passing a full 3D 1080p image.
Also: the TV saying "unsupported" would indicate to me you have a TV that doesn't support the resolution you are trying to send to it.