Intel has started to delete downloads from their Download Center when software reaches end of life. Intel will no longer make drivers or BIOS updates available for download once they reach end-of-life. This practice has been going on for some time and affects all Linux and Windows downloads including network drivers, bluetooth drivers, Aduino drivers, graphics drivers, BIOS, etc. If you have older Intel hardware that you plan on using in the future, be sure to make a backup of your drivers as they most likely wont be available.
Source: https://www.bleepingcomputer.com/news/hardware/intel-is-removing-end-of-life-drivers-and-bios-downloads/