This is for jD3.9 and Komento 3.1.4 It is not compatible with Komento 3.1.2
Please copy the unzipped file com_jdownloads.php to the Komento components subfolder '/komento_plugins' in your Joomla installation. Please also see the jDownloads Documentation.
Make sure that the option "Activate support for all Joomla content plugins?" is activated in the jDownloads configuration Frontend tab
Comments are only possible on the Download Details view
Check the settings in Komento
Do not use both Komento and JComments at the same time!!!
Please see the jDownloads Documentation (opens in a new window/tab) for details.