1. MS is pulling another ram down ya throat tactic ... when Windows Update detects windows 7 , it will not install updates... even though there's no hardware or driver issue involved ... just to force you to use Win 10 cause the data collection provides them with an income stream
https://arstechnica.com/information-technology/2017/03/microsoft-is-getting-ready-to-block-windows-updates-for-old-windows-on-new-chips/
A user created patch thwarts this tactic and you can install without issue ... however, expect MS to follow the same tactics they did before and continue to frustrate user preferences. benn on all the tech sites of late ... even the trade rags have picked it up.
2. You can still buy Windows 7 / 8
https://www.newegg.com/Operating-Systems/SubCategory/ID-368
3. You can install using the method here:
1. Prepare for Windows installation with USB tool
https://www.microsoft.com/en-us/download/windows-usb-dvd-download-tool
4. You can disable hardware updates using the method here:
http://www.sevenforums.com/tutorials/82137-drivers-turn-off-automatic-driver-installation.html