version="4.0" - The highest release version of software which can be installed in the JACE. If a newer version of software is installed, the JACE will fail on startup with a license version error.
NOTE: Niagara 4 licenses, starting at version “4.0”, are not backward compatible with NiagaraAX (version “3.x”) software. In Niagara 4.7, a host with a version=”4.7” license is able to run Niagara 4.0 software as well as Niagara 4.7 software.