The easiest way to update the Intel UHD Graphics 630 driver is to download the install package from Dell, for your specific model (mine is the 17R5). Then launch the installer, which will prompt you to -Install- or -Extract-. Choose the -Extract- button, because -Install- will fail just like in the SupportAssist app. Put the extracted files on a drive or folder of your choice.

Then right-click the Windows button in the bottom left and go to Device Manager. Expand -Display adapters- and right-click on Intel UHD Graphics 630, and select -Update driver-. Browse to the location you extracted the driver package to, and select the -Graphics- folder. Your UHD Graphics 630 will be successfully updated.

But, you're not finished yet. Launch the Dell SupportAssist app, which will still show the update for the Intel UHD Graphics 630. Hit the -Install- button and let it download and install the driver, which it will do successfully this time, after which it will prompt you to reboot.

Don’t waste your time with other suggestions that tell you to uninstall, reinstall, or remove battery. Those steps are not necessary.

Another issue that I think some might be running into is the SupportAssist recommending the UHD driver update even for FHD machines. So there is obviously not only an issue with SA installing drivers, but also giving people the incorrect drivers for their machines.