Before the upgrade procedure was automatic. You needed to replace ALL files also the config.php.
Problem is that nobody does this. (Me included)
And then you got those problems.
Use the config.php from the downloaded 0.9.3.
Fill all in and change the 1 into a 0.
But start from your side BEFORE you tried to upgrade. Otherwise you can get a corrupted database.
... can we help you ...