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Hello!
This warning occurs every time a file is downloaded
ob_flush(): failed to flush buffer. No buffer to flush in /wp-content/plugins/download-manager/libs/class.FileSystem.php on line 128
Changeing the line 128
from ob_flush();
to if( ob_get_level() > 0 ) ob_flush();
will make the warning dissapear. The file is still downloaded and I have not seen any drawbacks with it.
Could you please be included in the plugin!