So you have a site with content and its not concrete5. And you want to install concrete on the site?

That will not work. You need to have your content in concrete5.

Hi WillzShire,

I recommend reviewing this section of the documentation:
"Converting an HTML Template to a Concrete5 Theme"
http://documentation.concrete5.org/developers/designing-for-concret...

Let me see if I understand what you want:

You got an "old HTML" regular site and you want to install concrete on the same server?

Yes, it's possible, IF the server suports CMS and has database and such, you can install Concrete 5. It will be a bit mixed up on the root of the server but it will work.

You will have to manage your htaccess file so the domain opens up only the default html file and not the concrete5 default php file.

Then you can work on the C5 if you type something like domain.com/index.php/login/ and if user acces your domain they will get the "old" site.

After you finish the new C5 site, you change your htaccess root file so that that default file is the C5 and not the old html file. Then you delete your old site.