From your old machine you can export your work environment to a folder and then import this into your new installation.
Add-ons are probably best re-installed, but if you know which files they are, you can probably just copy them from the old machine to the same location on the new machine - generally in the Archicad program folder > in a folder called add-ons.
Any additional libraries that you use can be copied from the old machine to the same location on the new machine - only you know where you have saved them.
Barry.
One of the forum moderators.
Versions 6.5 to 27
Dell XPS- i7-6700 @ 3.4Ghz, 16GB ram, GeForce GTX 960 (2GB), Windows 10
Lenovo Thinkpad - i7-1270P 2.20 GHz, 32GB RAM, Nvidia T550, Windows 11