Filesfly.cc is a premium file host. Normally, downloads from filesfly.cc require a paid premium plan on their site. NeoDebrid lets you download from filesfly.cc at full speed for a fraction of the cost by generating a direct premium link.
JDownloader is a free, open-source download manager that automates file downloads. NeoDebrid accounts work with JDownloader for Filesfly.cc and many other hosts.
https://filesflycc.example/file/ABCDEFG