Wecome to the forum. I think you might not understand what Picture Style Editor is. It is a specialized tool for creating custom Picture Styles.
If you want to edit the images from your camera you can download Canon Digital Photo Professional.
Or you can use Apple Photos on your Mac.
If you start up the app Image Capture you can download the images from your camera.
Are you sure about that? OP seems unsure what to do when camera isn’t recognized by computer. Editing Picture Styles is an advanced level activity.
I’m guessing she wants to edit her pictures and the title Picture Style Editor is the closest sounding software on the site.
But I could be wrong.