Which operating system are you using?
It seems to work okay on windows 8.1 x64 in the 32 bit version of photoshop cs6 220.127.116.11, barring a few menu glitches in the plugin dialog.
If you want to use it in the 64 bit version of photoshop on windows or mac, you need at least the 3.110 version and then i think you need to install the plugin in an earlier
64 bit photoshop like cs5 and then copy the folder over to the 64 bit version cs6.
I actually used the color efex pro 3 plugin installer and pointed it to
C:\Program Files (x86)\Adobe\Adobe Photoshop CS6\Plug-ins
yes...... i can use