jDownloads 3.9 Beta 6 for Joomla 3.9 is now available for download.
You can find details of this release in the download 'details' page. The changelog is here. Also please note that this is still a beta release and there is a risk that it still contains bugs. So please test it on a development or staging site, not on your live site.
If you need somewhere to test then you can use the totally free cloud based Joomla! test site. Just click on the following link for more information Joomla Test Site 
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By selecting monthly in the Advanced setup, your own Joomla! test site will ask every month if you wish to keep using the site. So when you are done testing you just do not 'renew' and it will automatically disappear! Obviously you can load any Joomla! extension into your test site.
