[Plugin: WordPress Download Monitor] shortcode query

On the front page I’m trying to show more than the default 4 downloads under each category. From the userguide it says the shortcode is pop_cat_count

So I have the shortcode as follows:

[download_page pop_cat_count=1]

But it’s not working.

Any ideas or help would be greatly appreciated.

http://wordpress.org/extend/plugins/download-monitor/