I’ll send you a temporary link to the Readme file via PM, but it’s from SW 2.5.
Are you referring to this picture from TUIG?:
I’m not sure why those files have a “.1” on the end of the version numbers, but they’re still the 2.5 version.
Other than that, I see no reference at all in any of HanDuets three guides to a 2.5.1.
1/8 Edit: I spotted it later but still didn’t know what it was. Glad HanDuet clarified below.