For many corporate laptops, the OEM issues their own version of the driver which they have validated with the rest of the platform and which contains tweaks/hooks into their own utilities, hot keys, etc. The OEM version has both Intel vendor/device id AND an OEM vendor/device id embedded (so-called 4ID driver). The generic drivers from Intel (2ID) will not install over the OEM driver (4ID).
1) you can bug the OEM to publish an updated version based on latest Intel driver - they may or may not be motivated to update.
2) You can try uninstalling the OEM driver and then installing the generic one from Intel. You may lose some OEM customizations (e.g. special keys may not work...).
3) Or you can try downloading the one from Intel but NOT running the setup program - rather, go to windows control panel, devices, find graphics and select that you want to update driver. When prompted, you can then point at the .inf file in the directory where you downloaded the new driver. This bypasses the id check in the setup utility.