To Record Your Demos:
Download Open Broadcaster Software (Open Source)
https://obsproject.com/
Tutorial for OBS
https://www.youtube.com/watch?v=JJmVI98RVws
Download Filmora Wondershare to Edit Your Video
http://filmora.wondershare.com/video-editor/

Filmora will be an unregistered version. In order to get the full version, disable internet access to your computer.

I wont provide a link but you can google logins and passwords that all will work for Filmora.

Editing can be done with the unregistered version. Final export should be done without internet and full version.

Happy Filming!