Thanks for that, found it.
I'm sure in previous years the OS update came as a simple App Store update.
Ho Hum things change.
[doublepost=1538151589][/doublepost]Now I know where it is lurking, I'll hang on a while and see how it all settles down and wait until the wrinkles are ironed out before downloading it.
I'm not quite ready for the inevitable ('what the h**l is that, don't like it, how do I get rid of it).