Install Jd (addon data/jd) with JAL/Package Manager. Jd requires J64 (807 or later) on Windows, Linux, macOS, and RPI.
load'jd' NB. '~addons/data/jd/jd.ijs'
Recommended to NOT run a Jd production system from the ~addons/data/jd folder. Package Manager update could update this folder and your production system would be running a new code base that you had not tested.
A Jd production system should have its own folder. For example, copy your current jd folder from ~addons/data to create ~/production/jd.
load'~/production/jd/jd.ijs' NB. load production Jd