Extract all links on a webpage and export them to a file. It will let you get 20 links from Jdownloader to IDM. Increase this to 20, which is the maximum value. To get the links faster, at bottom of JDownloader you will find Max.Dls which means maximum downloads simultaneously. Later in IDM you can add the files to queue and set queue rules for number of downloads etc. (If you’re in a hurry, see at the very end for a quick list of all useful software and video tutorials)