Hope I haven't already posted this - the Search Thread isn't working.
I use
Debut Video Capture, having tried many other screen-capture programs. The quality is good, obviously limited by the quality of the display.
Download and install the program and use for the trial period, then when you are told that the trial period is over, uninstall (don't use 3rd-party uninstaller) and during that process you will get the opportunity to downgrade to free version.
The free version doesn't allow the addition of timeline and some other features, but it's fine for simply recording the screen.