Windows
You can download version 1.2.2 here. This is the first version of Archimedes Geo3D that is available in english.
You can evaluate Archimedes Geo3D for four weeks. After this you will have to buy a license.
Linux
Download Archiemdes Geo3D for SuSE Linux 10.3 here.
A version for Ubuntu Linux 7.10 can be found here.
Installation instructions: Unpack the archive, change the script Archimedes according to where you installed archimedes and start Archimedes using that script. The standard-examples will only be found if you install Archimedes in a folder "Archimedes" in your home-directory. If you choose not to do so, change the standard-paths in the settings-dialogue.
Mac OS X
You can download version 1.2.2 here.