So, since for many reasons I want to have windows 7 instead of windows 10 or Linux, I did my best but I got stuck. This also blocks the functionality of the AMD Graphics card too.
I installed windows 7 Ultimate 64bit on my new DELL Inspiron 5770 high end non-gaming 17 inch laptop, without any issue apart from the integrated GPU (Intel UHD Graphics 620). The question is, how can we make it work on 8th generation? Unofficially, with an easy trick up to 7th generation. Officially, Intel supports windows 7 up to 6th generation.
So, the big question for which I found no answer in internet.