I tried extracting (pkgutil --expand-full) an update package and copying it over the system. It still doesn't work, it's a WindowServer/graphics issue for sure. Whether it will be resolved on its own or require more hacks, I'm not sure.Considering that 10.14.4 has firmware updates that should be spoiling the installation, I don't understand how anyone can be certain that OpenGL is really broken as opposed to the installation simply being prematurely truncated. Short of downloading the update as a stand-alone pkg file which could then be modified to skip the failing firmware update, I wouldn't put too much stock in a badly behaved failing update.