All explosion data comes with a size slider by default now I believe. In this case, it just amplifies the intensity.
I wasn't aware that a different version existed, but my efforts to get it come up with dead links. The RTB link is dead (unsurprisingly) and it also seems that all RTB backup sites are also broken or unavailable.
I was only familiar with the test1, 2, 3 explosions that came packaged with some other unknown addon. I spent a good while trying to find its source, but came up empty handed.