I have an HP Envy Desktop (new October 2018).
The Conexant driver main number is 8.65.282.54, and this is also the version of chdrt64.sys. 8.65.282.54 is NOT one of the 8.65 affected versions, NOR is it in the 8.66.0.0 to 8.66.89.0 affected range.
In other words, it is apparently OK.
HOWEVER, the ISST Audio Driver file is uci64a189.dll i.e. in the AFFECTED range uci64a96 to uci64a232. Furthermore, the .dll file version is 7.189.0.0, which is a lower version than 7.231.3.0, and thus also NO GOOD.
It seems therefore that BOTH these have to be OK, for the update to be offered.
Another mess, coming on top of last summer's KMODE BSOD lockouts.
As usual, there is no evidence that HP have taken this seriously and tried to do anything about it, in the same way as KMODE.
Yeah, having either one of the incompatibilities will result in the update being blocked. I had both of the incompatibilities before I upgraded to 2004.
I didn't have to face the KMODE BSOD issue. Fortunately, I didn't face any issues of any kind after upgrading to 2004. Maybe because I removed every last bit of Conexant driver traces from my system before placing the Registry Block and then upgrading to 2004.
HP is not the only one to do nothing, my device manufacturer ASUS also didn't provide any driver update for this issue. Even after all this time, I don't have any driver update from ASUS (I got a driver update from Microsoft only after upgrading to 2004). At some point, I contacted ASUS customer service directly. They have got some incompetent imbecile as Customer Service Reps. (Indian region) that didn't even understand what I was talking about! They emailed me a solution thinking I was asking about how to obtain drivers for my device. A joke of a Customer Service.