The installation helper script is constantly being updated every time a new firmware is released and quite often will actually be ahead of most released versions of the firmware as they tend to implement updates as soon as they can obtain a pre-release beta which are quite often released for testing purposes. YouTube videos however, become outdated as soon as a new firmware is released.
Even now updates are being made to the helper script, for example at the time of writing this reply an update was made within the past hour
Therefore the installation helper will always be more up to date than a YouTube video thats around 1 month old.
Responded at the following thread as well as that is where the Helper Script link was posted…