: The developer offers a free two-week trial that includes all Pro features. After it ends, you can still use it as a free document viewer.
: Version 7.23 specifically added support for "Install Links," enhancing the software's automation capabilities.
If you're looking for for diagramming, you might consider Draw.io (diagrams.net) or Inkscape for vector design.
: You can purchase the software once to own that version forever, including all 7.x updates.
Visual Communication Software To Make Pro Diagrams - OmniGraffle