on mac you should install it in :/System/Library/Components

AE and Premiere now are able to export in this high quality codec at half the size of quicktime's Uncompressed 10bit.

VLC can't read UT because it doesn't use system components, but here you can find an update for vlc to register UT and some other video codecs. I don't know how to apply this register to VLC, so if anyone knows, your help is welcomed.

UT is helpful also if your thinking of using the new windmotion conversion tool across PC and mac platforms.