If you are getting 404 or Page not found error during installation the following possible reasons could be behind it :
The .htaccess should look like this:
RewriteEngine On RewriteCond %{REQUEST_FILENAME} !-f RewriteCond %{REQUEST_FILENAME} !-d RewriteRule ^(.*)$ index.php?/$1 [L]
RewriteEngine On RewriteBase /sub_foldername/ RewriteCond %{REQUEST_FILENAME} !-f RewriteCond %{REQUEST_FILENAME} !-d RewriteRule ^(.*)$ index.php/$1 [L]
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