The files in this thread are made with KiCad6 and all are tested with KiCad 6.0.2 or 6.0.10.
They may or may not run with KiCad 7 (not tested!) and several will not run with KiCad8, as there have been a lot of changes.
The examples shown in More simulation examples for KiCad/Eeschema/ngspice will not open in KiCad6 or KiCad7, as they are made with KiCad 7.99 or recent KiCad8RC2. They will open only in the latest nightly, which is moving towards KiCad8.
EDIT: Indeed Q17 does not run with the current nighly. I have uploaded a new version of this project.