Loading GPT2 model from Zamia Brain

Is it possible to load the GPT2 model from the Zamia Brain:
It seems to be in pytorch and 345M in size.

And the zip is available at https://goofy.zamia.org/zamia-speech/brain/gpt2-german-345M-r20191119.tar.xz

The zip contains the following files:
1.model.pt
2.optim.pt
3.params.json
4.sp.model