Extract the downloaded file "TH-K20_K40_V121E.zip" into a designated folder.
In the designated folder, a folder labeled "TH-K20_K40_V121E" will be created.
Had to look up 8.1 64bit drivers from support sites to see working results on some older expansion cards here.
The downloadable files below will modify the DWORD value in the registry key below.
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows Update\UX\Settings Exclude WUDrivers In Quality Update DWORD 0 = On 1 = Off This option will override Option One and Option Two.
But this will also make for selective updates as well as not seeing any like a build change if not opting for the Slow ring as far as the Insider builds go.
WD Black Edition 1tb Sata II 3.0 = 2 OS drives Pending WD Heavy Duty PC/Mac/NAS/CCTVDVR = 2 to replace WD 1tb Black Edition Sata 3.0 = 2 WD 1tb Green Power HD In external enclosure temp internal install until new drives go in.
This can be handy if you prefer to download and install your drivers from the device manufacturer instead.