Thanks for this great opportunity to seek out advice and do some networking. Sweetwater is simply outstanding! I am searching for some advice on installing my Komplete 4 upgrade (from K3). I have written to NI about installation of K4 with K3 already installed. Do I uninstall K3 before installing K4? Do I not? Is there anything I ought to do? Their answer was simply go ahead and install K4 and said nothing about K3 already being installed. I have seen many threads from frustrated users due to problems with registration/activation of the K4 upgrade for different reasons. No of them seems certain as to what causes the problems and they seem to get little assistance from NI. My K3 has worked beautifully since installing it, and I'd hate to throw a wrench into my work with a bad install of K4. Can you offer any advice? Can anyone out there offer any advice or suggestions? I'll appreciate whatever sound suggestions I can get. If all else fails, I supposed I'll do as NI suggested. Thank you very much, Jose.