It doesn't work

Hello Staff,
i’m writing from italy.
I’ve bought the pro version of this plugin, but it doesn’t work…
I can see albums thumbnail, but, clicking on it, gallery thumbs don’t appear..
I can’t kown why…
and, watching on my console, i can read this error message
Failed to load resource: the server responded with a status of 404 (Not Found)
http://www.meet-eventi.com/wp-content/plugins/easy-media-gallery-pro/css/styles/filter/-filter.css?ver=4.1

I miss this file…
Maybe, that’s why, i guess….
Or… Are there other reasons?

Hope in your answer.
Good work.
Angelo

https://ww.wp.xz.cn/plugins/easy-media-gallery/