As you can see the motherboard manufacturer for the model (mentioned by SabyasachiBose and who raised the issue) has to provide the appropriate driver.
https://www.gigabyte.com/Motherboard/GA-78LMT-USB3-rev-60/support#support-dl-driver
https://www.gigabyte.com/au/Motherboard/X570-AORUS-ULTRA-rev-10/support#support-dl-driver
We all expect centralised driver management by Realtek pushed through Windows update and not through the individual board manufacturers/vendors, don't we? Unfortunately, that day has not arrived.
@MichaelDavison3 It would be great if you can provide
the link of where you get the drivers from Realtek website as I am interested too to see how you downloaded it. Screenshots always help with the link.
(Been digging that site but unable to find a proper version-controlled list of 6.x.yyyy.z ...or maybe I'm looking somewhere else?...or version control does not exist?)