In LimeWire 4.2.5, if I leave the computer for a while and come back the program says "waking up". How am I supposed to download a movie if it goes into a sleep mode when I walk away? Is there a way to extend the amount of time in the program before it goes to sleep mode?

Don't worry--the download should continue when you walk away. Waking up just means it's connecting to more ultrapeers to be ready for searches. Once a download starts, you can even disconnect and it will continue.