Ah okay, that totally makes sense, and that was (at one point) the suggested way to updated (I used to do it this way myself).
However, with the latest release of the PGenerator ISO which enabled the Direct Lan connection, the PUTTY update method wouldn’t work and a completely new ISO had to be flashed. Since then it has become the recommended method to update should the need arise. But as things stand, there is no need to update PGenerator at all. It works as intended and there is nothing further that needs tweaking or adding.
With regards to Ted’s Disk - PGen Edition, as stated, it is a separate development hence the requirement for a separate ISO to be flashed.
Should other future separate developments take place, they too would require a separate ISO to be flashed.
I hope that clears things up a little better.