My Browser only want’s download install.php

Hey Dudes and Dudettes!

When I go to my “https://www.knivpelle.com/Bazil/wp-admin/install.php” directory, the browseR (Firefox) asks me if I want to download the file (install.php), It’s doesn’t show any installation window or anything like that (like its supposed to?)
And when i try to open the directory in Iexplorer nothing happends at all! I guess I got everything right in the wp-config file, cuz the browser finds the install.php file at least .. and that’s good, right?

What am I supposed to do? Please Help!