I have extracted and copied the source files from https://contao.org/de/download.html (Contao 4.1.2 zip) to my web space (givoo.de) per FTP.
After visiting the url givoo.de/web/install.php it tells me to set the password and directly after that I am getting this error:
Fatal error: Call to undefined function Patchwork\grapheme_strlen() in /kunden/484914_14059/webseiten/vendor/patchwork/utf8/src/Patchwork/Utf8.php on line 234
I mean, there is not much else to do. A composer or such is not needed with the newer versions beginning in 4.1 or so.