/blog/wp-admin/install.php was not found

I have just downloaded the newest version, 2.7.1, zipped on my laptop and ftped to my host server, followed all instructions to the tee and it doesn’t want to install.

When I type:
https://www.freeyourpotential.com.au/blog/wp-admin/install.php

I get:
—————————————————
Not Found

The requested URL /blog/wp-admin/install.php was not found on this server.

Additionally, a 404 Not Found error was encountered while trying to use an ErrorDocument to handle the request.
Apache/2.2.6 (Unix) mod_ssl/2.2.6 OpenSSL/0.9.8b mod_auth_passthrough/2.1 mod_bwlimited/1.4 mod_perl/2.0.3 Perl/v5.8.8 Server at https://www.freeyourpotential.com.au Port 80
—————————————————

The permission of all files is 744, the permission of the blog folder is 755.

I even added these lines in the wp-config.php file:
define(‘WP_SITEURL’, ‘https://www.freeyourpotential.com.au/blog’);
define(‘WP_HOME’, ‘https://www.freeyourpotential.com.au/blog’);

Nothing goes. I’m completely clueless now.

The only I can think of is that I had a wordpress.com account on the same URL, and I decided to install it directly on my server. I can’t see how that could affect it though. Just trying to stretch my mind.

Please help!

Thanks!