How can I keep my computer from sleeping while Internet Download Manager is downloading files?
Power setting will help you ..
Control Panel > Power Options ..
How can I configure IDM to turn off computer or disconnect from the Internet when download is completed?
i dont know if you can do that for sleeping but internet download manager has scheduler to Turn Off Computer When Done
If you don't want to change the power settings, then try out Insomnia: http://blakehandler.wordpress.com/2009/10/01/msdn-blogger-releases-insomnia-for-keeping-windows-7-awake/ or try Caffeine: http://www.zhornsoftware.co.uk/caffeine/.
i really appreciate ur reply. but how can i change "power settings" for IDM (Internet Download Manager).