Sounds like a JAVA issue.
Uninstall JAVA and then reinstall with the version on the 12 installation disc.
Once you have Archicad installed hen you can update JAVA if you need to.
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