@razi
Thanks a lot, I think it did the trick. At least I am now able to reach the front and backend. But I will test it further if it has any impact on the other funktions/modules.
But do you have an explantion for this?
@Prestashop Addict
Thanks for the reply, but of course this is the first thing I do, if there is any unexpected behavior or I do major changes and I tried it several times without any success. Already from the beginning I did not copy these files to the new destination.