Thank you.
I followed your instructions exactly. I am still getting redirected to wp-admin/core/install.php.
I had no .htaccess file before. Now, I have a .htaccess file that looks like this:
# BEGIN WordPress
<IfModule mod_rewrite.c>
RewriteEngine On
RewriteBase /
RewriteRule ^index\.php$ - [L]
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule . /index.php [L]
</IfModule>
# END WordPress
What possibly could be forcing a redirect to the “core” directory?