It seems that OGS v6 has become, preferentially, a Windows application in comparison to OGS v5.
There is a partial explanation at this link regarding Linux binaries:
Dune/DumuX, which is similar to OGS, has installation via a Python script. Their website provides you with a script that facilitates setting up a Dune/DuMux directory tree and configures all modules using CMake. Relatively easy to install and run reproducible research on Linux. If you use Windows, DuMuX recommends using Ubuntu bash on Windows.
Would it be possible to offer this python script approach to install OGS v6 on Linux?