To make double-sure, you can also check the creation/modification date of the ArchiCAD program file. I'm on Windows, so for me it's modification date.
If it is this January, you have the latest build (1965). If it is last September, it is build 1812.
Loving Archicad since 1995 - Find Archicad Tips at x.com/laszlonagy
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2x28" (2560x1440), Windows 10 PRO ENG, Ac20-Ac28