Luban does support v1 and v2 hardware. It’s just less work for them to maintain one code base than two. From what I’ve read on the forums, Luban is mostly just a rebranding of SnapmakerJS anyway.
You can still download SnapmakerJS from the forum. At least, I was able to download the latest version. I didn’t try older versions. You can probably find Snapmaker3D in the forums if you really want to.