The perfect driver for Intel UHD 620 for Windows 7 and Windows 8.1 for 8th geneneration intel processor
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Follow the steps in the following link
https://www.texpion.com/2018/06/Intel-7th-and-8th-generation-processor-graphics-driver-for-Windows-7-8-8.1.html
You can use 7zip App to extract the .exe driver file in a custom folder.
prepare Windows to accept unsigned drivers by the following steps
[
Shift + “Restart”.
Choose another option
Select “Troubleshoot“.
Select “Advanced Options“.
Select “Startup Options“.
Select “Restart“.
A menu will appear where you can press “7” on your keyboard to choose “Disable driver signing enforcement“.
]
After restarting the PC in the selected required mode yo can run the Driver setup file from the custom folder.
Wishing good luck for all.