How to add "Log In" Button to download

See Screenshot - I added a load of documents to a category & with ACL Manager, I set that these can only be downloaded by members of a certain group.

But in Category/Table View , How can I make the download button show as a "You Need to Log In" Button, when members are not logged in.

Also is there a way to add a message in the category, to display to non logged in users, letting them know they need to log in?
I know I can do this with a custom module & use NoNumber Advance Module Manger, but wanted to know if there was an easy way in eDocMan that I may have missed.

mynewsite.me.uk/merseygpst/gp-trainer-gr.../st-helen-s-knowsley

Hi,
Unfortunately, currently, Edocman doesn't have feature to add Login button. But we will consider to find solution to add it in future.
Thanks
Dam