how do I customize CoursePress Pro theme without it breaking on updates?

Hi,

I am using CoursePress Pro theme.

As you know, its theme files are a subfolder in the plugins folder.

Thus, I am unable to make a child theme for it.

Now, the thing I want to change is expressed in the attached screenshot. Basically, I have video posts that are assigned to the Video post format. However, they are showing up with the featured image first, and then video second. I want to get rid of the featured image. However, I cannot do that with custom CSS whereby I hide the featured image class because it will also hide it from the category archives. I need to edit the template (or so I think).

How do I achieve this in a way that survives plugin updates?

Thanks!

David