After the recent Windows 10 Cumulative update KB4034674 my Merc Stealth Keyboard drivers has stopped working. Specifically the Alpham164.sys is not being activate/trusted in Device Manager. Uninstalling the update allowed it to start working again. I can only push windows updates so long.
Uninstalling and reinstalling the driver software did not work. SteelSeries.com no longer supports the Merc Stealth, so there is no Windows 10 specific driver but it has worked fine until this patch.
How can I get Windows 10 to trust/allow Alpham164.sys?