Direct link to request access form: https://ai.meta.com/resources/models-and-libraries/llama-dow...
Direct link to request access on Hugging Face (use the same email): https://huggingface.co/meta-llama/Llama-2-70b-chat-hf
Direct link to repo: https://github.com/facebookresearch/llama
Once you get a link to download on email make sure to copy it without spaces, an option is to open it in a new tab and then download. If you are using fish or another fancy shell, make sure you switch to bash or sh before running download.sh from the repo.
I am not sure exactly how much space is needed but it is likely north of 500GB given that there are two 70B models (you are given the option to download just the small ones in a prompt).
Edit: The_Bloke on HF already has them in GGML format available for download.
https://huggingface.co/TheBloke/Llama-2-7B-GGML https://huggingface.co/TheBloke/Llama-2-13B-GGML