Isn't the latest https://downloadcenter.intel.com/download/26228/Intel-Graphics-Driver-for-Windows-10-and-Windows-7-8-1-15-40-?v=t  ?

Yeah that looks newer. Intel's site is pretty terrible. Please use the one you linked.

I think those drivers supported. I see:

I. Product Support
Supports Intel(R) Iris(TM) graphics, Intel(R) Iris(TM) Pro graphics and Intel(R) HD graphics on:  
	6th Gen Intel(R) Core(TM) processor family (codename Skylake)
	5th Generation Intel(R) Core(TM) Processor Platform (codename Broadwell) 
	4th Generation Intel(R) Core(TM) Processor Platform (codename Haswell)

I think the HD 4600 is a 4th generation graphics processor, which means the CPU in there should be Haswell.

That package would not install.   The processor is a i5-4590t so according to this 15.40 is only available in Windows 10.

https://downloadcenter.intel.com/product/78928/Intel-Core-i5-4590T-Processor-6M-Cache-up-to-3-00-GHz-

I installed the 15.36 package (which is really installing 10.18.14.4414, go figure)

[build74-b1] run: echo -n |powershell.exe -Command 'Get-WmiObject Win32_PnPSignedDriver| select devicename, driverversion | where {$_.devicename -like "*4600*"}'

[build74-b1] out: Intel(R) HD Graphics 4600               10.18.14.4414

[build75-b1] run: echo -n |powershell.exe -Command 'Get-WmiObject Win32_PnPSignedDriver| select devicename, driverversion | where {$_.devicename -like "*4600*"}'

[build75-b1] out: Intel(R) HD Graphics 4600               10.18.14.4414

Thanks! Ken, we should find out if it's possible to receive driver upgrades on Windows 7 past the 15.36 package, or if Intel is dropping support.

Jamie, could you reach out to Intel with that question?

Peter, is it technically feasible to upgrade this machine to Windows 10?

Yes, it's feasible.

Thanks Peter. Filed a follow-on bug about doing that upgrade.