From what I can tell Java 8u45 is the correct version for 19.
If you have anything newer you can try to in-install it and install Java 8u45 - available here ...
http://www.graphisoft.com/downloads/java.html
That may not be the issue though as I don't know if the goodies rely on Java to install.
I know Archicad and the hotfixes (updates) do.
To make sure Archicad is definitely not running go into your processes and see if it is listed there as running.
On a Windows system go to Task Manager.
I have no idea where to look if you are on a Mac.
If none of this works I am out of ideas for now.
Barry.
One of the forum moderators.
Versions 6.5 to 27
i7-10700 @ 2.9Ghz, 32GB ram, GeForce RTX 2060 (6GB), Windows 10
Lenovo Thinkpad - i7-1270P 2.20 GHz, 32GB RAM, Nvidia T550, Windows 11