There have been many versions of FarmBot Genesis. See past versions for details. FarmBot through the years may also be interesting.
Since version 1.1, we have switched to OnShape for hardware design. As you have found, the files for the previous versions are still available. You can find the latest version 1.1 files in the FarmBot Genesis OnShape document.
In the document, in addition to all the native design files, there is a Meta folder in which you can find PDFs with labeled drawings for each part. There is also a drawing that you can export as a DXF with all the plates in it, and an assembly with all the 3D-printable parts that you can export as STLs.