For installation, make sure you have NextGEN Gallery already installed. Upload the folder nggallery from the zip file to your theme folder /wp-content/themes/[your theme]/. If you already have other templates they will not be overwritten.
To use it, in the short code you use to add NextGEN Scroller set the template value to dop-thumbnail-scroller.
If this is not the case, please send your WP and ftp login information to help.
In a private reply.