s2member plugin customize file download with hooks [closed]

Question

I'm using s2member plugin to restrict downloads. it has several hooks that can be used to customize the functionality. here are the hooks documentation : http://www.primothemes.com/forums/viewtopic.php?f=40&t=9134&src_doc_v=110605

this works :

add_action('ws_plugin__s2member_before_file_download_access','wpc_notify_file_download');

function wpc_notify_file_download(){
    wp_mail('test@example.com','test','test');  
    wp_redirect( '/thank-you/' ); exit; 
}

but if I use the after download access hook, it doesn't work, the hook doesn't seem to fire.

also, if a non member tries to download, they are redirected to a register page, I'd like the download to start automatically once they register and log in.