To repro:
Install the latest versions of unsloth and transformers

!pip uninstall unsloth -y && pip install --upgrade --no-cache-dir "unsloth[colab-new] @ git+https://github.com/unslothai/unsloth.git"
!pip uninstall transformers -y && pip install --upgrade --no-cache-dir "git+https://github.com/huggingface/transformers.git"

try to import unsloth, receive error:
/usr/local/lib/python3.10/dist-packages/unsloth/kernels/cross_entropy_loss.py in Unsloth_LlamaForCausalLM()
NameError: name 'Unpack' is not defined

This doesn't affect demo notebooks as they don't import the latest version of transformers. An older version of transformers can be used but doesn't work as well with gradient accumulation and gives the warning "Unsloth: Using our custom gradient accumulation fixed trainer, which is not feature complete."