I did the stupidest thing. I started the Windows 10 update, choosing to upgrade later thinking I could keep postponing the actual upgrade indefinitely until I was sure my main program would work with it. But what I got instead was a choice of today, tomorrow and the next day only! Can I just shut down my machine and will that stop the whole process? Or 1) will it prevent my machine from shutting down properly? 2) will it install the upgrade the next time I reboot? 3) will it install upon reboot if i do a hard shutdown?
I'm told that I can delete the KB3035583 files and that will prevent it. But can I do that at this point? If so, where do I find all of them to delete them? Is it possible to do it when I'm one step away from the update starting (see attached jpeg). I know I can revert to 8.1 within the first 30 days but i will need my Windows 8.1 product key. It came with the machine so how do I find that?