Have you done what it says : "To upgrade to the new Prochannel EQ, discard the Sonitus:fx EQ by Control + click on this button."?
 
Until you do you'll get this message every time you try to use the PCEQ

Sorry Jonesey. Yes, I have done what the message says, and it has allowed me to use the EQ now. I was just answering a couple of questions that were asked earlier, to clarify the situation. I realize that I should have also stated that the problem was solved, my bad.
 
Thanks for all the help folks.

Would you be kind enough to edit you thread title reflecting its solved please.