The warning on Intel's download center page says:
End Of Life - This download, BIOS Update [RL86510A.86A] P21, will no longer be available after November 22, 2019 and will not be supported with any additional functional, security, or other updates. All versions are provided as is. Intel recommends that users of BIOS Update [RL86510A.86A] P21 uninstall and/or discontinue use as soon as possible.
Intel to delete very old drivers and BIOS from its website on November 22
Posted on Tuesday, November 19 2019 @ 13:43 CET by Thomas De Maesschalck