Guys,I know almost everyone know this trick,but i still want to share that downloading udemy videos or coursera or etc directly to your PC how means,
download extension IDM from chrome store
download IDM(probably not cracked)
NOTE= May be IDM exe file installed and the IDM chrome extension must be same version to download the video.
just play the video which ever you want to download,u will get a small banner right or left download with IDM click it selcet the resolution download it.
NOTE2= I know u can download from udeler by just one click, but this trick work on other websites also,i tried with coursera and you tube premium videos worked(the video must be playable of full length).