FlashGet is not available for Android but there are some alternatives with similar functionality. The best Android alternative is Free Download Manager, which is free. If that doesn't suit you, our users have ranked more than 50 alternatives to FlashGet and seven of them are available for Android so hopefully you can find a suitable replacement. Other interesting Android alternatives to FlashGet are uGet (Free, Open Source), aria2 (Free, Open Source), Multithreaded Download Manager (Free, Open Source) and Advanced Download Manager (Freemium).
This is an experimental Firefox 57 download manager with multithreading support. It can download files with multiple connections to the server. Depending on the network condition, this may increase the download speed.