FIFTY BUCKS!!!!! HELL No!!!!!
No, no NO, FREE, that's what you need!!!
Download YouTube Downloader 2.5.7
Then use it to download the video file and then use it to convert the file to a WMV and play it in Windows Media Player. Use the speed control in Windows Media Player to slow down the video to any speed you wish, and it keeps the correct pitch too which is nice!!
ALL FOR FREE!!!!!