I recently purchased, received, and setup a Thinkpad X1 Carbon 6th Generation from Lenovo. The laption came pre-loaded with Windows 10 Pro. I have discovered that certain software that I run and VPN connections that I need to have active, are not compatible with Windows 10. I therefore need to replace Windows 10 with Windows 7 Pro. Other than getting the Win 7 Pro installation media, I am not quite sure how to proceed with the install. My guess - which may well be wrong - is that I turn the X1 off, connect an external DVD drive containing the Win 7 Pro install media to it, and force it to boot from there. After that, I'm not sure if I just follow the prompts.
Any help or suggestions would be very much appreciated.