Due to the new hotlink protection in place, you may notice Jdownloader isn’t fetching the link correctly. Instead of copying/pasting the “uploadhaven.com/” URL, you need to copy the exact URL after the download starts. For example, “download162.uploadhaven.com/..”
What we recommend is starting the download regularly on a browser, then pressing Ctrl J on your keyboard. From there, you can copy and paste the direct download link, then place that link into JDownloader and even Free Download Manager.