Quoting from here:
Very easy installation, I even compiled the build of cfMesh previously prepared for blueCFD Core 2017, but it doesn't seem to work properly. The mesh generation never converges, taking even one day before a Ctrl+C, where the same mesh is generated in few minutes with my previous installation of blueCFD Core 2017. I will keep using and switching between both installations (2020 and 2017).
Quoting from here: