Installing Invoiceplane in a subfolder - "404 Error"

Support
3
  1. See below
  2. Yes. I have PHP 7.3.15, MySQL 5.7.28 and all the other stuff
  3. Yes
  4. What rights does the user need?
  5. Debian, its Netcup.de
  6. PHP 7.3.15

.htaccess:

<IfModule mod_rewrite.c>

  RewriteEngine On
  RewriteBase /invoice
  RewriteRule ^index\.php$ - [L]
  RewriteCond %{REQUEST_FILENAME} !-f
  RewriteCond %{REQUEST_FILENAME} !-d
  RewriteRule . /index.php [L]
  
  ## Remove the hash in front of the following two lines if you want to force HTTPS
  RewriteCond %{HTTPS} off
  RewriteRule ^(.*)$ https://%{HTTP_HOST}/$1 [R=301,L]
  
</IfModule>