There are features of this that don’t exist in the core. If you don’t need it, don’t buy it. If you already own it, and find it unnecessary now, uninstall it. Easy peasy. 😉
I don’t own this add-on, but is it an actual cover gallery the admin sets up? Or is is a self made gallery by the pictures you upload?
Try uploading some covers and see if it starts building a cover gallery for yourself. I could be wrong but that is the conclusion I’m getting from the description of the add-on.
Cover gallery. All cover uploaded by users will be stored and for later use