When I play a downloaded video, it is incomplete and only 10/15 seconds, and re-downloading it doesn help. Now what?
Youtube Downloader uses Internet Explorer to download files. If your download was interrupted, IE may have saved a corrupt copy in its cache that you will need to delete so you can download the complete file. You need to delete your Temporary Internet Files and browser cache. To do that in IE8, open Internet Explorer and click on Tools, click on Internet Options and on the General Tab, in the middle of the screen, click on Delete in the “Browser History” section. In the window that opens, uncheck everything but “Temporary Internet Files” and click “Delete”. Now close all the open browser windows and try downloading the video again.