Publishing Assistant is fully tested and supported for InDesign version CS6, CC, CC 2014, CC 2015, CC 2017, CC 2018 and CC 2019.
Theoretically Publishing Assistant also can work with InDesign CS, CS2, CS3, CS4, CS5, and CS5.5. However, only limited testing has been performed on these versions. And only limited support is available for InDesign versions prior to ID CS 6.