really simple SSL 500 internal Server error

Hi, I have the same problem since the really simple was updated 6. 04 I think.

I have a 500 internal server error.

I try to reinstall the old version of the plugin or to write on the htaccess file but it doesnt work.

# BEGIN WordPress
# The directives (lines) between "BEGIN WordPress" and "END WordPress" are
# dynamically generated, and should only be modified via WordPress filters.
# Any changes to the directives between these markers will be overwritten.
<IfModule mod_rewrite.c>
RewriteEngine On
RewriteRule .* - [E=HTTP_AUTHORIZATION:%{HTTP:Authorization}]
RewriteBase /
RewriteRule ^index\.php$ - [L]
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule . /index.php [L]
</IfModule>

# END WordPress

I’m not a webmaster and I manage my website alone.
Could you help me ?