It's blocked because the Universal Audio Architecture (UAA) HD Audio class driver is included in SP3 and Microsoft already planned to do that when the Hotfix was built. The included generic HdAudio.sys driver was useful at that time (new standard), but there are much newer drivers for all supported controllers in its .inf file.
I understand, I changed the file to be partially like SP3. I edited it because it's useful for hardware used including new realtek. Because I got ACPI from Dietmar some months ago, if I don't install this update the sound won't work.