I'd remove it unless you are using the paid/full version.
It is known to install spyware in the free mode.
From
http://www.safer-networking.org/en/articles/download-managers.html FlashGet (1.40, spyware-infected or paid mode)
FlashGet can be installed in two modes - one ad-sponsored, one ad-free shareware mode that needs registering. I tried the ad-sponsored version, and indeed it did install Cydoor.
The interface by the way reminds me strong of one of the other tools I tested (screenshots will be added later to this article). With only 5 simultanous download connections, it was only half as fast as Download Express, but it can be set to use up to ten.
My opinion about this one is that you can get better download managers for free.
If you dont mind it collecting info and about you and targeting you with crud then go for it! I'd use another download mananger such as umm i dunno... Download Plus