Installation of Letsencrypt SSL on Bitnami Stack

Thanks for your quick response. I tried what you said but it didn't work. I had a look at my .htaccess file but there's no blocking rules in there:

RewriteEngine on
RewriteCond $1 !^(index\.php|public|\.txt)
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule ^(.*)$ index.php?$1

<IfModule mod_php5.c>
php_value upload_max_filesize 10M
php_value post_max_size 10M
</IfModule>
#test pickup