Easiest way to stop Windows 10 spying is to install it, make sure it is activated and has all the drivers,etc. then disconnect it from the internet (disable network adapter - right click > disable) and run it as a dual boot with an online Windows 7 and/or Linux.
Works well for me. That's also what I'll be doing if I need to buy a new 7th generation processor where Microsoft have now maliciously denied access to Windows Update for Windows 7 and 8.1 with these new processors - offline Windows 10/online Linux.
Biting the hand that feeds IT
