[Plugin: NextGEN Gallery] Problems with path and folder name

Hi,

two questions:

1. I should install the NextGEN Gallery plugin in a folder with name nextegen-gallery (as the folder into the zip file) or with name nggallery?

2. I have not problems with images, but if I public an album and I select a thumbail to open the image or a gallery I receive 404 error, because the path don’t exist: http://www.domain.com/nggallery/page-323/images. Why?

Thanks!
Alex

http://ww.wp.xz.cn/extend/plugins/nextgen-gallery/