Hi nighthawk246,

Many adware will offer to download third-party software because of pay per click, pay per install commission. They don't care if the software is good or bad. Ads in a program is called adware which we might want to avoid installing (the third-party software).

It is now common to see such so it is better to avoid installing any third-party software without checking the reputation of the other program.

Other user reports on Internet Download Manager is at:
http://www.siteadvisor.com/sites/internetdownloadmanager.com/msgpage
http://www.mywot.com/en/scorecard/internetdownloadmanager.com

If you want to view a Flash Video (FLV), use any of the free software below:
VideoLAN's Video media player http://www.videolan.org/
Winamp free (standard edition) http://www.winamp.com/media-player/en
NOTE: If any of the above will offer third-party program during installation, UNCHECK the box or any button so you won't get unnecessary programs.