Try drivers from this list Downloads for Intel® HD Graphics 4600
Select OS from right pull-down menu. Hit "show more".
To bypass message "best driver is already installed", "customized computer manufacturer driver" or "computer is not validated" install driver via have disk method as described at:
https://www.windowscentral.com/how-install-intel-beta-graphics-drivers-surface (ignore prolog about MS surface)
Important: current drivers for Windows 10 require anniversary update or newer
I have taken a look at the information detailed at your links; the official Intel 4600 HD drivers listed on the Intel page you linked to are not as recent as the ones currently installed, so I'm still not sure how the PC repair guy managed to obtain later versions of the Intel drivers listed on the Intel and Lenovo official sites and where I can get them.
However, because I'm still getting BSOD, I'm probably going to roll back the drivers to the earlier version at your link anyway.
Thanks for taking the time and effort to respond; it is appreciated.