That sounds like you haven't quite got concrete5's files in the right directory. When you see a directory listing, it's because the webserver can't find a index.php (or index.html or whatever it looks for by default).

Commonly the public folder for your hosting is public_html. In that, you'd want the folders for your concrete5 install, so, application, concrete, packages and updates, along with an index.php file and a couple of text files.

The concrete5 download zip will unzip to one top level folder, but you really have to take the contents out of it and place them in the root directory.

Wonderful. I moved the folders and now have the install screen displaying on my home page. Thanks for the quick support, even on a holiday!! :)

Before I go ahead with the install, how do I make sure my permission settings are correct?

The installer should check the permissions, or it least it will check whether or not it can write to the directories it needs to.

Normally when you unzip a zip on a server with something like cPanel or FTP files up, the default permissions tend to be correct to begin with. It's really if things are configured poorly on the server or you are mucking around with permissions that you need to really think about it.

If you can see the permissions of the files and folders and they look like 0755, it should be good to go.

How do I check permissions? I'm "seeing" the files via FileZilla.

One of the columns when you are viewing the files on the server should show the permissions, or failing that, you should be able to right click on things and view permissions that way.