Changes to the gallery

Hello.

In which file can I make changes to this collection.

https://dev.adventureprojekt.com/downloads/naturparadies-masuren/

I thought it would be the “nextgen-download-gallery / templates / gallery-download.php” but no matter what I change there, it has no effect on the page.

Thanks for your help

The page I need help with: [log in to see the link]