Hi there,
Thank you for your reply and the link.
I have found all the information about how Duplicator is supposed to work, but not much about what to do when the php does not execute but downloads instead.
With the help of an expert, I got at step further yesterday, meaning that the installer.php launched and took me through the three Duplicator installation steps. Everything seemed fine BUT at the 3rd step where you check your new localhost-site, nothing there only the folder with the different files present – and again an php-issue. Very strange especially as the php is working on my other localhost-sites.
So if you have any ideas, please do not hesitate!
Thank you,