Issues with KM Engine

[rlivingston]

I think the problem is in the Wait For Safari to Finish Loading step.

Safari 12.1 broke the Wait For Safari to Finish Loading action

There is a very simple native solution without needing a plugin. In Safari, the "Save As…" menu item works the same way the "Stop" menu item used to. When a page is loading, Safari disables "Save As…" until the page is fully loaded. So simply use the action "Pause Until Conditions are Met", and have it pause until the menu item "Save As…" is enabled.