Why not make a little refresh in your toolbox by adopting Motrix, a download manager nice, clean and efficient ?
Motrix is free software that runs on Linux, macOS and Windows, and that allows to download files via HTTP / FTP, BitTorrent (including via magnet links), as well as Baidu Net Disk.
Motrix supports up to 10 instant downloads and each download can be divided into up to 64 threads, maximizing the speed of download.
It is also possible to change the User Agent in the software settings to make the server believe that you are using Transmission or Chrome or another. And of course, downloads can be continued where you left off.
It is far from the flexibility of a JDownloader but it is a good little tool that will replace the download manager of your browser or your old BitTorrent client. Developers will be able to take advantage because Motrix also supports third-party extensions.