There is an app that downloads several parts of videos and puts them into one encoded video file. The video file is only playable inside of the app.
I have both the encoded videos and some of the videos before their proprietary encoding.

This is the link for videos:
http://videos.imedicaldoctor.net/cmeinfo/usmlerx2019/Parts/Antimicrobials-Oseltamivir,...anamivir.mp4.1
http://videos.imedicaldoctor.net/cmeinfo/usmlerx2019/Parts/Antimicrobials-Oseltamivir,...anamivir.mp4.2
http://videos.imedicaldoctor.net/cmeinfo/usmlerx2019/Parts/Antimicrobials-Oseltamivir,...anamivir.mp4.3
http://videos.imedicaldoctor.net/cmeinfo/usmlerx2019/Parts/Antimicrobials-Oseltamivir,...anamivir.mp4.4
http://videos.imedicaldoctor.net/cmeinfo/usmlerx2019/Parts/Antimicrobials-Oseltamivir,...anamivir.mp4.5
http://videos.imedicaldoctor.net/cmeinfo/usmlerx2019/Parts/Antimicrobials-Oseltamivir,...anamivir.mp4.6
http://videos.imedicaldoctor.net/cmeinfo/usmlerx2019/Parts/Antimicrobials-Oseltamivir,...anamivir.mp4.7
http://videos.imedicaldoctor.net/cmeinfo/usmlerx2019/Parts/Antimicrobials-Oseltamivir,...anamivir.mp4.8
http://videos.imedicaldoctor.net/cmeinfo/usmlerx2019/Parts/Antimicrobials-Oseltamivir,...anamivir.mp4.9
http://videos.imedicaldoctor.net/cmeinfo/usmlerx2019/Parts/Antimicrobials-Oseltamivir,...namivir.mp4.10

and this is the apk file:
https://imedicaldoctor.net/imd122.apk