This is an oxygen theme for JDownloader. It is basically 95% based on the Oxygen icon theme set (great thanks to its creators), but some icons had to be taken from the Oxygen Zion cursors theme (thanks as well). I myself have only composed a few of the icons that were specific to JDownloader.
1 Extract contents of archive into your JDownloader folder.
2 Open JDownloader and go to the
-> [User Interface]
-> In the [Look] section, choose oxygen under [Theme].
It's a first try so please comment here if you have any suggestion on how to improve it.
Thank you for your feedback!