Hello, the two last updates of TranslatePress causes a htaccess rewrite. If your site is domain.com after the update in the rules:
RewriteBase /
RewriteRule . /index.php [L]
TranslatePress rewrite to
RewriteBase /en
RewriteRule . /en/index.php [L]
(or any language active in your installation)
This cause a internal server error 500.
Please solve this.