I found a solution for this problem at the very bottom of the config.php file. I edited the following part where config-dist.php says "do not edit" and it worked:
if (file_exists("/myserverpath/moodle/lib/setup.php")) {
include_once("/myserverpath/moodle/lib/setup.php");
I hope that this will solve your problem, too!
Installing and upgrading help
setup.php not found - but server paths are correct
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