After a day trying to change the Drupal version XXXfecking!x core, I decided that maybe someone else will work-out how to do this more simply in future as has been very well done for modules. I am still happy each time I download a module in a lazy way, knowing what a chore it was to move files about and read or amend text files next to them a year or two ago; so much depends on things that vary between individual users, like whether I had put my altered & site-specific files in a folder called "sites" away from the default files, and whether I have read the text tile called readme.txt which tells me to rename the default.settings.txt file to "settings.txt" and change a line in it. All fine if you're used to it and good at it but otherwise a bit like trying to fly before there were seats on cheap airlines; the choice is pay or make your own plane and ask strangers online for advice while they can't see what you are building. And if you're selling honest goods made in a democratic welfare state, there isn't the margin to pay, as McDonalds still do, to get a good version of Commerce Kickstart going.Following the Youtube video by Tom Geller that I transcribed before, I'm using Aquia Drupal's stack installer. Can I just adapt the Aquia Drupal that comes with it from scratch? There is a nag message that says I should disable and delete all their chosen extra modules before it goes, and then says that some of the modules cannot be disabled. I ask the sales chat thingey: "How do I uninstall the Aquia modules? (I want to keep things simple for now and maybe use Aquia help later, so I want to start with core drupal and nothing else)"
Answer: "just go to drupal.org and download Drupal 7 core". So I am back to following the Youtube video by Tom Geller that I transcribed before.
