Depending on the host the file still will not be created or written too running the installer with those permissions Lucky. Probably better to do the files at 666 or 777
I would bet your config file is empty meaning the write was not performed.
I manually installed redux as the installer is to be honest rubbish. Delete the .htaccess file. Go to cPanel (or your control panel) password protect the Staff folder. Chmod the Staff, Global and Mods directory including all the files to 666 or 777. Edit the installer file on line 231 so it now reads
if ( is_writable('./Global') ) {
Install. Chmod Staff, Mods, Global directory to 755 and files to 644 or less and your done.