go get -u https://github.com/Chyroc/163-opencourse-download
163-opencourse-download -dir ~/download https://open.163.com/movie/2008/1/Q/9/M6SL23BRS_M6SL2J9Q9.html
or
163-opencourse-download -dir ~/download http://open.163.com/special/opencourse/paradigms.html