Unless you haven't, you should chmod the entire dadabik directory.
Also, make sure that the parameters in config.php, the essential ones at the top, are correctly set. Watch out for missing slashes, commas, quote-marks, etc.
One assumes that you have set the MySQL database with atleast one table.
The 'command not found' error you report seems not to be a dadabik-generated one. Are you trying to execute install.php through some command console? You have to do it through a web browser - localhost (or yourdomain.com)/dadabik/install.php.
I hope this helps!