RewriteEngine on

Options -Indexes 

RewriteRule ^install\/ ./index.php?r=install/main/index [L,QSA]

# if a directory or a file exists, use it directly
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d

# otherwise forward it to index.php
RewriteRule . index.php
DirectoryIndex index.php

addDefaultCharset utf-8