How can I modify the query?

I’d like to change the query to only return images.

I can change DavesWordPressLiveSearchResults::pre_get_posts() in the plugin code itself, but is there a hook I could use to do the same thing without rendering the plugin un-upgradable?

This is the code, by the way:

// Get images only
$query->set( ‘post_type’, ‘attachment’ );
$query->set( ‘post_mime_type’, ‘image’ );
$query->set( ‘post_status’, ‘inherit’ );

https://www.ads-software.com/plugins/daves-wordpress-live-search/