Ummm.... seems there's many differences between the content of the ZIP download and individually downloading each video from the B4X YouTube channel.
It's quite a job for a Beginner to tell which is the most applicable to keep/watch. Unfortunately, I can't use Date to identify the latest as the Zip extract does get a real(?) creation date, the YT downloads get today's' date.
Attached is an Zip containing an HTML report from WinMerge.
If security is a concern, JPG screen-shots also attached.