There is an “update” for ngspice (Windows 10 only, sorry) available at http://ngspice.sourceforge.net/download.html#kicad .
It contains all bug fixes up to yesterday. It is experimental code from the ngspice git branch pre-master, but stable enough to give it a try.
A howto ist included in the zip file.
If you closely follow the installation procedure, there will be no problem to revert the install.