For old GPUs with OpenGL 2.0 the LATEST version is SweetHome3D 5.4.

Keep in mind that different GPUs can support OpenGL 2.0 but can also support some (different between them) OpenGL extensions.
So, there is a (tiny) chance that other GPUs with OpenGL 2.0 support will run e.g. up to version 5.5 and others up to 5.3.