Plugin for hiding content behind login form?

I have been searching for a plugin without luck.

My client has a site where he has a team of workers who should be able to see some documents that shouldn´t be accesbile to the public.

He will create a WP page and put links to the download files.
And this page should be hidden behind a login box/form.
He will register his workers with their email and a password so that they will be able to login and see the page with the downloads.

What I´m looking for is:

– A plugin that has a nicely desinged login form
– The form should be placed on a specific page with a short code
– After logging in the user should be able to see the content on the page and NOT log in to WP, he should only get access to the content on the specific page
– It should be possible to add users with their email and create a password for each user

I hope someone can help, it will be greatly appreciated!