Alternative for Gigaget downloader?

Gigaget downloader is no longer maintained by the developer and it is also not working with android 6.0 always getting unfortunately close error. Is there any alternative for this app ?

We can already manage several downloads from the notification panel or from withing a good browser like Firefox.
So why do you need it?

Well early I was using uc browser for downloading . Most of the time Ucbrowser works at background without even using it. Hibernation is also not working with it. So decide to uninstall it .
But comparing with other browsers, uc is top in downloading speed, no other browsers can give that downloading speed. That’s why I’m looking for download managers. Download managers can give speed like uc.
Download managers like ADM has same speed as uc but it’s not open source.