Podolsky's link is a direct one to download only Archicad 20 INT.
This link will get you the USA version.
https://graphisoft.com/downloads/archicad/install/AC20/USA/
In fact just change the version and language in the link and you can pretty much get any one you want.
I am not sure if 'MyArchicad' will be any good unless you have downloaded that old version before.
I think it only lets you get the last 2 versions.
And if you have a physical codemeter key - you just plug it in to which ever machine you want.
Barry.
One of the forum moderators.
Versions 6.5 to 25
Dell XPS- i7-6700 @ 3.4Ghz, 16GB ram, GeForce GTX 960 (2GB), Windows 10
Dell Precision 3510 - i7 6820HQ @ 2.70GHz, 16GB RAM, AMD FirePro W5130M, Windows 10