List Category Posts With Pagination

If you are after post and category post pagination I would recommend using http://wordpress.org/extend/plugins/wp-pagenavi/

Much higher rating than the plugin you found.

If you want to increase the number of posts per page this can be done in WordPress dashboard under Settings > Reading > Blog pages show at most

you might try a plugin called “advanced excerpt” it lets you specify excerpt length globally or per loop. Also lets you remove content filters from the excerpt.