I solved that error.
Now to get better guidance I wanted to setup the Techzone Demo site on my space.
I extracted on the web space the "JA Techzone Quickstart Pack Joomla 4", I connected the subdomain to the webspace, but when I call it no installation is started. Should not a "quickstart" file be present in the root? There is none.
The subdomain is techzone.irislichtinger.com
Should Joomla be pre-installed or is it coming with this quickstart?
Thanks for your help.