I have an older cbus controller (circa 1999) and can access and modify the original Key4/2/1 switches via the cbus toolkit (ver 1.10.9), however recently I had a faulty Key4 switch replaced with a KeyC4. When I go to edit this Unit, I get a "Error - 2064" message requesting I get the updated version of the toolkit. I go away and upgrade my toolkit to ver 1.15.7 and go to connect, I get a msg that it can't read the Project and I have to upgrade the Project. Any ideas??