Does anyone know where the latest version of the Adobe Indesign scripting documentation can be downloaded ?
The latest version can always be accessed through the latest version of the ExtendScript Toolkit editor. Look in the Help menu for direct links to Adobe's own PDFs, and for the current up-to-date scripting reference for your system (this information is created on the spot for your current setup -- you just can't get anything more recent).
Adobe stopped supplying PDF files for the full reference about a decade ago.
As browsing the Help from within the ESTK is cumbersome, especially if you are not sure what exactly to look for, people took it upon themself to translate Adobe's Help file to reader friendly HTML -- me first , up to about CS6; these days, grefel does so and posts fully linked documents at his site. CC2017's are at InDesign ExtendScript API (12.0)
Thank you for the quick respons.