Sure, thanks for that!

OSL related nodes need several fixes, due to the changes in Blender 5.0 APIs.

In which version does it crash?

This new updated version provides improved Octane preset files.

Sure.

viewtopic.php?t=85315

This addon update fixes a problem happening when switching to an Octane Preset from some of Blender's own presets:

From the developer:

"It's a Blender crash and I've used a trick to fix it. Basically, calling wm.read_homefile directly from a menu-invoked operator can crash Blender in some templates (e.g. VFX), due to UI post-processing accessing invalid RNA pointers."

I've tested the new addon version ...

What do you mean by "your template missing a preferences file to first load octane when you switch"?

OK , After many tests and continue crashing I installed Blender 5.0 and just octane, no custom template.
I just tried to switch on valila blender templates that come with the program like 2Danimation,general,vfx,sculpting,storyboarding etc, when i tried to switch again to octane any of the ...

Sure!