RewriteEngine on
RewriteCond %{REQUEST_URI} !^/_wpez20/
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule ^(.*)$ /_wpez20/$1
RewriteCond %{HTTP_HOST} ^(www.)?occcustomsite.com$ [NC]
RewriteRule ^(/)?$ _wpez20/index.php [L]
ErrorDocument 404 /_wpez20/index.php?error=404