If this is not a posting concerning downloading, installing, setting up software then you should find the appropriate product forum and ask your question(s) there.
Here is a link where you can access any of the many product forums available:
The Lightroom forum is here http://forums.adobe.com/community/lightroom
Short answer is, yes, Lightroom 4.3 supports tethered shooting with Canon 5D Mark III
Yes, tethering the 5D Mk3 is supported in LR 4.3 http://helpx.adobe.com/lightroom/kb/tethered-camera-support-lightroom- 4.html