For the record.. SKS6 and SKS5 can exist on the same PC so you can use sks 5 if it's still available through stardock central.
I'm still trying to get a definite answer, but that may no longer be true, NT
I've gotten a few reports that the latest beta of SKS6 *asks* you to uninstall SKS5 ... don't know if that is mandatory or not.
Haven't tried installing the latest SKS6 beta yet .. don't want to bork something until I'm sure SKS6 will do everything that SKS5 would do ... still might need SKS5 for a couple of skins I'm working on.