Certain packages not installing

I’m having a hard time getting modulus to work. I installed via pip onto a HPC.

Most of the packages in modulus are available for import, but some are missing. For example, the modulus.solver package won’t load. “import modulus.solver” returns an error message. As far as I can tell from online examples, the solver package is pretty vital.
I also tried to install on Google Colab and had similar issues.

How can I move forward?